Martin,
Telerik will support IE7 when it is released and all r.a.d.
controls should work correctly in that browser. They are always testing their controls with future technologies (like FF 2.0 and VS "Orcas") to ensure compatibility. For a full list of telerik control browser compatibility, check out this link:
http://www.telerik.com/support/requirements-and-compliance/browser-support.aspxI've been testing my sites (which use almost all of the telerik controls) in IE7 since its original beta (on both XP and Vista) and I have not observed any problems with the
telerik controls. CSS problems, yes. r.a.d. control problems, no.
Let me know if you have any additional questions or concerns about IE7 and I'll be happy to help.
Thanks~