SublimeVideo is an online service that lets you upload videos and embed them as HTML5 videos that fall back to Flash if HTML5 isn’t supported (usually the opposite is true). They now have a free plan that lets get unlimited plays, video lightboxes (where the video pops up over the web page when you click on a thumbnail), and more. The only “catch” of the free video player there is a simple “SublimeVideo” badge in the bottom-right corner.
I’ve been using Vimeo for the few and far between times I post video to this site, but in the future I’ll be giving SublimeVideo a shot.