I've been learning a lot lately about SQL Server Express 2005.  There is still one advantage that MSDE will have over SSE that has almost nothing to do with its feature set.  It is that MSDE will still run on the 9x platform.  I know that many folks say that is not important.  How many small companies or organizations are still running 98 on some PC in the corner?  How many charities or not-for-profits have the latest equipment? 

I am a proponent of enticing these groups to get up to date with newer equipment, but many of these places are struggling and think that a Pentium 300 is a fast PC.  When developing with MSDE or SSE, consider the audience and what is the “worth” of your application.  Is it worth the trouble of these organizations to beef up their older equipment to a respectable PC? 

There are many nice things about SSE.  Don't get me wrong, but make sure that the client is able to run the app on the equipment they have.

Another $.02 in the pot.....