I had a T42 with the last company I consulted with and it was fine, slow, but it had XP and I didn't get to do a fresh install, plus I'd be running linux on this machine, most likely through USB 2.0, since I find it to load distros faster than the HD.
So what's out there.. I can pretty much get either for between $120 and $200 (give or take this and that) on ebay..
Differences I've found are that the T42 use DDR vs DDR2 on the T43, but they both max out at 2GB. Processor wise, they both range from 1.6 to 2.0Ghz. I know the T42 uses a different chipset and video card I believe.
T42, less noisy and hot and a bit longer battery life (which when I had seemed like 3hrs max.. but this could have been the battery and XP).
Everything else is mostly identical, if anyone has had a chance to compare both or heard of which is better to run srictly on a linux distro etc.. Please help me decide.. I could probably find the T42 for lets say $50 less than a T43.. I just need a machine strictly for my tools of the trade. Thanks!