I decided to blog about my non-experiences at TechEd 2005. I didn't get to go... It sold out before I could get all my paperwork at work to go through. Right now I would be experiencing the Key-note. I think this was going to be delivered by Steve Balmer (since I couldn't go I lost interest in seeing what all was going on).
I would probably be hanging out with Darrell and DonXML, and probably would have a couple chats with Rory Blythe and Scott Hanselman (Ok, maybe not Scott since he really doesn't know me).
If you didn't go because you missed the cut off or you couldn't afford it, I think there's no reason you can't blog about it (everyone else is blogging about, so why not you, too).