Hi, I too own a tecra 730XCDT
I would recommend debian 3.0 stable (woody) for the linux distribution. Its a bit more complicated to install than suse or redhat or whatever, but the trick is to avoid installing KDE or Gnome and whatever bloats suse or redhat.
Install the base system, set up apt, then apt-get wmaker wmcpu wmnet menu apm wmbattery etc. and what apps you want. apt-get synaptic for a graphical installer once you got X running. For a small but efficient browser i would recommend dillo, but use apt-pinning to install it from the testing distribution or from backports. Dont expect koffice or openoffice to run bearable, but abiword <2 and siag-office, ted, emacs, lyx works reasonable.
I've seen that the problem with full resolution is in the dotclock, which should be set to 53 MHz in the modeline for 1024x768 in the device section, (this modeline must be inserted by hand. this seems only to be the reason for 15 and 16 bit. Sometimes X want to use the CRT which must be cycled to the LCD with Fn-F5.
To get sound working I installed the 2.4 kernel and used sndconfig for cs423x. Check IRQ etc in Bios. Unfortunately this broke the PCMCIA support, which means that I'm off network right now:-( Yesterday I got it working but today it wont. There seem to be a conflict in the sound><pcmcia irq, which I probably need to change in the bios or at module loadtime.
Check out http://www.astro.umd.edu/~teuben/lin.../tecra710.html
for some great info about hardware etc.
is in some foreign language for me, but hdparm -A1c1m16k1 /dev/hda speed up harddisk app. 25%