Replaced my Kingston 16gb class2 sdcard with a Transcend 8gb class6 one today to see if there're some improvements. And yes there are!

Much, much, MUCH better!

- 1st bootup doesnt take ages and the phone is much more responsive in the setup wizard.
- Almost no 'force close or wait' errors anymore (got them pretty much all the time on the class 2 card).
- Wifi responds better (well, browsing and downloading goes much better, so might be the faster sdcard, not the wifi performance perse).
- The whole OS seems more snappy.
- The phone doesnt get that hot anymore.

Maybe the Kingston was slow as hell, but I would recommend a class6 card straight away when you want to install NITDroid on one.