I made some progress with my Dell Inspiron E1505, but still have some stumbling blocks. I was unable to get the X server to start with Ubuntu Breezy 5.10 with the 1650x1080 WSXGA+ display and the Intel 945GM chipset. When I changed the device from "i810" to "vesa" and added a line for 12M of VideoRam, the X server comes up and the display works. However, the resolution is 1280x1024, so the aspect ratio is incorrect for the screen. The result is that graphics and text are stretched horizontally. (An image of me makes it appear that I gained 15 kg :-})
I looked at the 915resolution hack, but didn't try it, since it has to be applied with every reboot of the system. I also looked at the beta release of Ubuntu (Dapper 6.04 flight 6), but it also appears to have problems with this display and chipset.
Any other suggestions will be appreciated. Also, has anyone been able to make this display and chipset work properly with any other Linux distro? Thanks.