ReSharper is a lot like TiVo.  Once you “get it”, you get it.  Get it?  :-)

JetBrains has released version 2.5 for VS 2005 but even better is that they are having a sale.  You can pick up a personal license for only $99.

This is a personal license but if you can't get your employer to buy you a commercial license you can still develop with pleasure but at a great savings!  Plus it is yours and you can take it with you.