The folks behind Microsoft's video sharing site MSN SoapBox have a team blog at http://soapboxteam.spaces.live.com. You should swing by and say hello. You might learn a thing or two. For example, I found out from the post entitled Spaces and Live.com Embedded Video Gadget that one can create a playlist of videos that is displayed when the SoapBox player is embedded in another website. The relevant excerpt is shown below

Dare spent the weekend updating his Embedded Video Gadget to allow Soapbox ideos to play within a Spaces and Live.com gadget.  The good news is that the Embedded Video Gadget now allows embedding single videos, as well as multiple videos, such as My Videos and My Favorites. 

The videos you see at the top of the Soapbox Team Blog, are an actual My Favorites example.

This is a pretty sweet feature and one I've not seen used a lot by other video sharing sites. I've been exchanging some mail with the team and they've been pretty good about responding to feedback and sharing information. If you have some ideas for the team or just want to find out how to get an invite to the beta go ahead and leave a comment in their blog.