Um, about my earlier IE8 post -- let's just say there have been some stability issues over the last few hours, and I'm glad the Windows Live Writer team has a Firefox extension :)... I still expect I'll be on IE8 full-time, as the beta progresses.
The Blog This for Firefox extension adds a button to Firefox which starts a new Windows Live Writer blog post prepopulated with content and title from the current web page. Blog the whole page, or just selected snippets. Interacts with other registered plugins to parse and structure web content where appropriate. Blog quickly when you find something of interest on the web.