Glad you enjoy our site! The Nokia N810 isn't exactly a PDA, which is generally considered to be a small, easily pocketable device that syncs PIM data (contacts, calendar, to-dos and notes).
The N810 is what Nokia pretty accurately calls an Internet tablet. It's a very small wireless Internet terminal that also handles email, RSS feeds and a some other things including a few games. It's great for instant-on access to the Net, and it can double as a portable GPS. I use it when I want to check my email or lookup up something on the web without having to boot up a computer. It lives mostly in the living room and bedroom. I don't generally take it places with me as I do a PDA.