TinyShark is brilliant.

I'll add another to this list. Logmein. Though it is a paid app I think?

It lets you connect to and use my PC while I'm out and about.

I'm all about actual practical apps. Tweetdeck is damn useful because it lets you have most of your social networks on one app which is dead useful in terms of saving battery usage. I had to start looking for something else because that official facebook app is fucking AWFUL for the battery, it fucking drinks it.