Same here. I got mine about two months ago. I also installed 10.04. I love the trackpoint (the red pointing stick in the middle of the keyboard) and the mouse buttons just below the space bar (don't have to leave the keyboard to use the mouse).
The only major issue that I have now is the inability to control the backlight. This seems to be due to a bad driver by nvidia [1]. The backlight controls work if you use non-nvidia drivers. This will shorten your battery charge considerably.
Other than that, everything works out of the box. I use the 64-bit version.
Yes, the backlight is the only thing that doesn't work so well. I can control the backlight - I think I had to tweak some setting that I found on Google, but I don't remember which - but its auto-darkening on inactivity is pretty broken. When I move the mouse or type a key, the screen brightens again, but only about halfway back to what it was before the auto-darken, so I then have to manually jack the brightness up each time this happens.
Hoping some new driver release will fix this some time, but it's only a minor irritation.
BTW, your link [1] seems to be broken?
I love the trackpoint. I've disabled my touchpad completely.
Yes, the forums' website is down. Here is the google cache [2]. The link [1] entitled "NVIDIA Quadro NVS 3100M on Lenovo Thinkpad T510: NVIDIA Backlight Control Causes Buzz" is the first result in the search for "t510 backlight" [3].
The issue has also made it to Canonical's launchpad [4]. The link [1] is mentioned in comment #27 [5].
[1] http://www.nvnews.net/vbulletin/showthread.php?t=150069