Resharper — fix multiple issues
Edit: since VS2010, the shortcut is Alt+Page Down, not F12.
Not that I know of. I do this by repeatedly pressing: F12, Alt+Enter.
(The F12 key moves to the next error or warning in this source file; Alt+F12 moves to the next error in the solution.)
With the latest Resharper, you can batch-fix issues in a file or a project: