@Crabolsky: Good to hear about your purchase. Shame on me, I got the 4G a couple weeks ago, and still sitting in the drawer gathering dust. I dont know what to do with it. I do not have another N810, and I have quite a few fullsize SD for my N800. Well, let us know how your 4G card turn out.
Are you going to play with KDE? I am planning to. I partition the 8G into a 2.4 G initfs and should be enough for KDE installation.

bun