The RTW release of Silverlight Tools for VS 2008 is out!  There are no functional changes from RC1, and hence no upgrade prompts or breaking changes.  The hot-fix was re-built for servicing reasons, so please do upgrade.  If you are upgrading from RC1, you should see the following packages being updated:

sltoolsrc1_to_rtw

The non-English releases are still being translated; since there are no functional changes between RC1 and RTW, there should be no issues with continuing to use those RC1 releases.  We will release the localized RTW as soon as we have the translations done.