Ok, online impressions.
So I made my level, it was ready to go, and I invited a few GAFfers. While I'm not really an online gamer person...I wasn't expecting how truely awesome this was going to be. It's remarkable to see three people playtest your level right in front of you...it's just crazy. And it's a hell of a lot of fun.
Races, something that looked a bit lame in the videos I've seen, is actually a ton of fun. Most of the online levels up right now cater to the LBP 4-player parties, and some of them are pretty brilliant (none of them are quite on the scale of a full-fledged level just yet; it's mostly fun runs and experiments).
What's even more awesome is the online persistent world of LBP. You can see a ton of levels on the main hub, and see how many people are playing each one. It was cool to see a few people in my level as I jumped around with my LBP chums, and it even alerted me when someone beat and rated my level.
Loading/downloading times are super quick...it feels like a regular game load, and I forgot that it was even downloading the new level for the party. When people join the game lags up quite a bit and gets nutty for a few seconds, but once everyone is in it's a fairly smooth ride.
You can choose to play online levels either by yourself or online, where you'll join up with whatever strangers are in the level at the moment. There's a full list of leaderboards and you'll be able to tag the level with lots of keyphrases like "ingenious" "cute" and "Braiiiiiiiins..."
I absolutely cannot wait till tomorrow after work to play more, and to see how my (rough) level is doing. What an amazing game.