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Joel on Software
User Interface Components in .NET
We've been test driving some stuff you might find interesting - check out www.dotnetmagic.com
DevExpress components are great. Although I only use their Delphi components, they also make .NET versions.
DotNetBar looks alright to me, also for $999 you can get the source code + a site license. It's on my list of controls to have a proper play with and see how it really performs, so sadly I can't give a proper review.
I've also used Infragistics components in the past, they're quite spiffy.
Everyone I have showed these ( http://www.dotnetmagic.com/ ) to have made positive noises.
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