being able to browse my data. Setting a break point that browsing through the data to make sure it is the way I expected it

In addition to what Bonnie said....VS2005 has new debugger visualizers. You can now browse a dataset, examine XML, etc. while debugging.

(I'll be the first to admit, the debugger in VS2003 wasn't that great. The one in VS2005 is MUCH better).

KG