I never noticed this but if you write a plus next to a word the word, the word's baseline is lowered until a space is inserted between the 2.
+foo vs + foo
try it and watch the baseline shift when you add or remove the space! (This was the case a few minutes ago in Firefox 5. They might have fixed it by now. I am sure they are doing live bug fixes via continuous integration.)
Oh, and by the way, typing a + followed immediately by letters allows you tag people in your posts. '@' works the same way. No apparent functionality for hashtags.
Let's see... more testing:
The image uploads scale nicely. You can upload many at a time it seems, and they all get assembled into a little collection. I can't wait to see what the gallery looks like and what I can do from there.
If you upload pictures, the only other thing you can tack on to the message is a location.
The location tracker is a bit inaccurate, which I am kind of thankful for since I am at home. I have removed it because I don't want to broadcast that information. That might be useful if I ever got a smart phone ... lol.