the ability to embed messenger 'stuff' into your web applications, now you can! just announced the ability to provide your status as well as have people interact with you directly on your web applications/sites.
how do you do it? visit http://settings.messenger.live.com/applications/CreateHtml.aspx to create the html for your specific presence/messenger account. you first have to enable the ability to do it (i.e., you'd be allowing anonymous visibility into your messenger status), but once you do, you'll be able to cut and paste.
on my blog (if you are reading this through a reader) i've added my presence indicator as well on my contact page, you can start a messenger chat with me in the browser.
very cool for messenger users/developers! get yours today!