Alfred is one of the most useful tools I think I own on my Mac it speeds up production speeds like nothing you've ever seen. One of my biggest gripes with Mac OS X though is the faff it takes to show hidden files / folders (including 'Library' in Lion).
As a result of this I have made an Alfred extension to give you the ability to show / hide hidden files. All you need to do is open Alfred and enter 'hiddenfiles show' or 'hiddenfiles hide', it's as easy as that!
The extention is now a tiny bit more clever. Now if you just type 'hiddenfiles' without a parameter it will toggle the hidden file and folder visibility. The old method of forcing the visibility is still working too.
Note: The Alfred v2 version supports shortcuts.
Command + Option + H toggles hidden files.
For those of you who like old things. Version 1.0 Download