I came into a problem on one of my machines where the WordPress permalinks were not working.  Typically, I go to the WP backend and click Settings >> Permalinks, then resave what I have there so that WP updates the .htaccess file.  However, that did not do the trick this time.

After some digging, it turns out that the “mod_rewrite” capability was off – probably as a result of recently upgrading to WAMP 2.5.  It’s really easy to fix too – under the WAMP tray icon, just click Apache >> Apache Modules >> rewrite_module.  Found the solution within this SO question.