I did the first apt install according to Howto I found. Probably it won't help you as its in German. here's the link anyway. The linux-resticted-modules are installed.
Here's some news: If I run the installation, skip configuration of X and startx immediately, it works, until the feared reboot.

Surprise surprise to you Though not fluent anymore, I can read my way through that I lived in Germany for 10 years.

Anyway, if you followed that step by step it really should have worked. I noticed in the questions portion that others had the same error as you did with the api mismatch (here: Have you tried via synaptic to download the nvidia glx that is available?

Oh, I am heading out from work right now and will not be back on for about two hours. I have not given up. I will think on this more.

I saw that Dirk had the same problem. It was solved by adding nv to dissabeled. I did not do that because said nv in there. Should I have added a second one? I installed the regular glx with apt-get, not synaptic. In the howto it states that this should not be on the system. It wasn't when I first tried until dfowensby said I should install them. When I kicked them off again I had one error less while starting x. So I've both ways, currently the're not on.

Here is the relevant portion of my xorg.conf (I am at home now, so this is easier).

Is yours similar?

Have you tried an older driver via synaptic; one that matches your kernel?

My xorg.conf looks pretty much the same, except for obviousley a different device Identifier, 30-90/50-60 sync rates. (Those are the ones nv always works with and nvidia until reboot) and resolutions going upto 1680x1050 (frontend support of the display).

Have you tried installing an earlier version of the drivers? I can't figure this out. Unless it all has to do with the 64 bit... if so, I am at a loss as I've never used one.

not certain bout how pre-Feisty o.s. would treat it, but with just clicking synaptic's nvidia-glx-new (~9755) and Applying it, then editing the xorg.conf as i said before, this is what works on mine (both 32 and 64-bit. i'm running 32 at this time). here's the whole ball of wax:

Section "Files"
FontPath "/usr/share/fonts/X11/misc"
FontPath "/usr/share/fonts/X11/cyrillic"
FontPath "/usr/share/fonts/X11/100dpi/:unscaled"
FontPath "/usr/share/fonts/X11/75dpi/:unscaled"
FontPath "/usr/share/fonts/X11/Type1"
FontPath "/usr/share/fonts/X11/100dpi"
FontPath "/usr/share/fonts/X11/75dpi"
# path to defoma fonts
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "vbe"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "true"
EndSection

Section "InputDevice"
Driver "wacom"
Identifier "stylus"
Option "Device" "/dev/input/wacom"
Option "Type" "stylus"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection

Section "InputDevice"
Driver "wacom"
Identifier "eraser"
Option "Device" "/dev/input/wacom"
Option "Type" "eraser"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection

Section "InputDevice"
Driver "wacom"
Identifier "cursor"
Option "Device" "/dev/input/wacom"
Option "Type" "cursor"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "nvidia"
BusID "PCI:1:0:0"
EndSection

Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 31.5-72
VertRefresh 50-160
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "stylus" "SendCoreEvents"
InputDevice "cursor" "SendCoreEvents"
InputDevice "eraser" "SendCoreEvents"
EndSection

Section "DRI"
Mode 0666
EndSection

If you're really brave/desperate, copy this to xorg.conf, change the values for your monitor, reboot, and "See what happens..."
Luck -O.

After my upgrade to feisty crashed resulting in a totally messed up system, I clean installed ubuntu via net install. I choose between KDE and GNOME during login, but dumped Kwin and Metacity to use Beryl. Those are some neat desktop effects. Anyhow, I am so enthusiastic about these effects, that I'm getting off topic... Once feisty was running, I checked the nvidia-glx-new drivers, and configured X as dfowensby just said in the previous post. Since then its flying. Thanks again for the help, thoughts and time jkirchner and dfowensby!