We are currently developing a mirror image of our current client/server desktop application to be web based.

I have been in manual testing for several years, but this is my first task involving automated testing. The application is built in .net with a SQL2k back end.

What tool do you guys reccomend for a beginner to be able to test this type of application from front to back?

I know this is a bit open ended, but any suggestions are appreciated.