Alright! Another PS3 user! I am OmegaAmen on PSN and feel free to add me to your friends list (in fact, I will add all you guys if you don't mind).
I strongly suggest that you upgrade your hard drive for your PS3.
This is the hard drive I am using. A lot of PS3 and PSN games use quite a bit of hard drive space, and as your library grows, your available hard drive space will shrink quickly.
Other hardware to consider is
the Official PS3 Bluetooth Headset, which will come out in a couple of weeks.
Also, since you are looking forward to playing LBP, it really utilizes
the Playstation 3 Eye camera (it also has a mike).
I have... well... a lot of PS3 and PSN games, but I am not sure what type of games you really like. I strongly suggest playing Uncharted: Drake's Fortune. For multiplayer action, Warhawk is very popular, and SOCOM: Confrontation is bound to be very popular when it is released.
Check out the Playstation Store for some great downloadable games. Super Stardust HD, the Pixeljunk games, Bionic Commando Rearmed, Mega Man 9.... Wipeout HD is absolutely amazing, and you can purchase Burnout Paradise for download as well.