So far I've refrained from having blogs on any of the main .NET sites for a couple of reasons. Most of the time what I'm working on I can't actually talk about - NDAs and all that. Also I already have a blog so didn't want the admin nightmare of double posting, or remembering where I'd posted something. But tonight I finally got off my backside and did something about it and wrote a tiny front-end for .Text that cross posts to multiple blogs. I'ts not very complex - just the FreeTextBox component and few extra bits, sitting on top of a web service client to the .Text web service. So now with a single post (and this is the first) I can post to multiple blogs with just a simple button click.
I've built in support for categories and blog selection, so I can decide which posts go where. All posts (many of which are personal) will go to my main blog (which is also reused as my Al and Dave diary, but only work related posts will go other blogs, such as the one on ASPAdvice.