UPDATE ON MY PREVIOUS POSTS:
I must report success on LAN adapter, (thanks to Raditude), I downloaded the AttansicL1c driver from http://code.google.com/p/iats/
and works fine.
I update my system regularly from the Apple site, ALWAYS skipping system updates (preventing overwrite of drivers) but allowing the rest (new versions of iTunes, Safari, ecc are ok).
Starting this summer I installed several pieces of free/shareware programs sometimes getting weird errors.
For example, opening JPG images doesn't work (Preview utility). I found another way to see the files (right-click then choose Quick Preview or something similar, my menus are in italian).

SOFTWARE ISSUES
I didn't install many software yet, but noted some install problems:
- Google Chrome installs and works fine, but when I tried to add the 3D Earth plug-in the installer locks at some point
- Audacity (audio editing software) comes in a .DMG package, and works fine from that location, but when I try to move it to the Applications folder it doesn't work anymore... found a couple of tutorials that explain how to solve that but they didn't solve.
- The Divx free suite installed fine but the player crashes on start. Anyway I needed the codecs and they work fine.

BTW wouldn't it be great if someone collected in a database or something similar the success/failure stories about software installs on Hackintosh machines? Anyone knows about a site like this?