I've been working just with rdlc reports with the Visual Studio 2005 report viewer and I have some complains.
NO HTML support! if you have html stored in a field you can't report that if you do, you'll see the all the html tags.

If you need to report that field you need to create a function to ignore the tags and display simple text.

I'm waiting for a the new release... I hope VS2008 will have some major improvements.

Regards,
Seba