Have PM'd you!
Glamour - what do you want to get out of it?
For me, it's primary fun and amusing. Chat/banter with people I 'know' from MN, and then from people you get to 'know' on Twitter. Mostly inconsequential but often very funny. I've also got to know my MN friends a bit better, in a funny kind of way, because you're talking directly to each other, not just reading a long thread that loads of other people are posting on.
I follow a fair few journalists and political bloggers, and they provide new and information, as well as links to other interesting sites.
I follow various news sites, so it's a great source of news and breaking news. Again, they often post links to other stories/sites.
I follow some celebs (although I'm going to cull many of them). Some of them are entertaining. If you follow celebs who also follow each other, some of their banter can be funny. @caitlinmoran is funny, as well as @victoriapeckham, and @indiaknight. They are also likely to reply to you, which most celebs don't bother to do. For most of them it's pure self-promotion - perhaps not surprisingly!
For work, I have a company a/c, and use it to promote my company (although not very assiduously it has to be said!), and I also follow some of our clients and competitors, so it's helping me keep abreast of changes in the industry.
You can get anything out of it that you wish, IMO - but only if you're on there.
Give it a whirl! It took me a while to really 'get it', and you do have to have a certain number of followers as well as follow the right people before it gains any kind of critical mass.