Sounds like you're ready to switch over to Linux as well. I'm currently looking at different Distros to get a good feel for which one I'd like to use first.
As for getting Steam to run, you need Wine. From everything I've read, Steam runs really well on Wine, but the same is not true for all the games that run on Steam. For getting Steam to run, check out the Steam page on the Wine App Database.
++++ Addendum ++++
You might also want to check out the Steam under Linux page on the Valve developer wiki.

If you're running Ubuntu 8.04 then the instructions are only slightly different. I might eventually post some updates in there. Basically the only difference is that instead of going through all of the nonsense of reconfiguring xorg.conf and blah blah blah, just go to System -> Administration -> Hardware drivers and enable the proprietary nvidia driver.


Sorry...can't help you there then. Their Linux support is probably better but years ago it was awful. Furthermore, I haven't used an ATI card since I tried a 9800 pro a few years back (in WinXP), spent about 8 hours trying different drivers (Omega drivers I think?), installing the ATI drivers then uninstalling "smartGART", installing the ATI drivers without "smartGART", flashing my motherboard BIOS, reformatting, etc. etc.too bad i have an ati card

Sorry...can't help you there then. Their Linux support is probably better but years ago it was awful. Furthermore, I haven't used an ATI card since I tried a 9800 pro a few years back (in WinXP), spent about 8 hours trying different drivers (Omega drivers I think?), installing the ATI drivers then uninstalling "smartGART", installing the ATI drivers without "smartGART", flashing my motherboard BIOS, reformatting, etc. etc.
After 8 hours of trying but ultimately not getting it to work at 8x AGP (it always said 0x AGP no matter what I did) I took the card back to the store and got a refund. It will be a cold day in hell before I try ATI again.
I of course wrote all of this up and emailed ATI about it. Their response was "Did you try installing the drivers without SmartGART? You can obtain this from our website." ----- I didn't bother to reply but my answer was yes. Yes you jackass I did try that. That is why I wrote it in the email that I originally sent to you which you obviously did not bother to read completely. But am I bitter???
Yes I am!
In any case, the rest of the how-to should be completely relevant. As long as you figure out how to install the latest ATI drivers in Linux you should be set.
and if they dont, there is drivers for it on ati website 
