I'm sad, I admit there are sometimes very small things that get added to products that get me excited, one of my fave small things in SSRS 2005 was Multi Value parameters. The All option was especially handy for a bunch of reports that we use internally, especially over here in Team System land.

For all the right reasons the team pulled the All option from SP1 of SQL Sever 2005, however based on, ahem, significant feedback, its back in a hotfix and will be rolled into SP2.

You can read Brian Welckers very articulate and insightful mea culpa here.