I wish people would not read some old blog post or forum thread about URL’s and change all their page names. Do not ever change your page names. There is no reason whatsoever to do it. Even if you switch from asp to php or some other server side language you can keep your old url’s with a very easy tweak to your system regardless of what web server you use.
There is no benefit to switching to keyword rich url’s. As a matter of fact 100% of the time there will be a negative effect in the short run.