Well, after doing a bit of a look-and-seeing, it appears that the most popular micro-blogging system is Twitter.
I have signed up, and posted a few messages in it – and I have to admit, it does have features I find far more useful than Pownce.
Ok, Pownce is written in Adobe Air – but as a [...]

I just signed up to Pownce, which is a similar sort of thing to a Blog like this, but you only post relatively short messages, and it has the ability to network with friends and notify them of new messages you post accordingly.
The other benefit is that you can VERY easily post to it – [...]