Check boxes seem like a minor hassle on most web sites, but if you find yourself confronted with a plethora of check boxes and no "Select All" option, Toggle 'Em All is quite handy.
Stoyan Stefanov built the bookmarklet when faced with an inconvenient site interface:
Recently I decided to clean up all the spam from an abandoned phpBB forum of mine, there was a lot to delete. In the phpBB version that I use there is no option to "check all" topics you want to moderate. So I came up with a little bookmarklet to do this for me. Here it is, only improved to work within frames and toggle (check if not checked, uncheck otherwise) all checkboxes in sight.
If you find yourself staring down a lengthy list or repeatedly using an interface without a handy "Check All" button, Toggle 'Em All is quite a time saver. If you dig the idea of supercharging your browser without the bloat of extensions, make sure to check out our roundup of must handy bookmarklets. Toggle 'Em All [via gHacks]