incrediBILL - 2:00 am on Jan 31, 2013 (gmt 0)
BTW, I forgot to mention a very important fact.
Once you switch to using a redirect script it's hard to turn back. I had mine always blocked in robots.txt to stop crawlers from crawling through it to avoid 302 hijacking back in the day. However, if you unblock it in robots.txt or better yet remove the redirect script, suddenly your site will set off red flags for unnatural linking and you'll get penalized.
Once you go down this path you're kind of stuck there as the best you can ever do if you want to get rid of the redirect script is set all your links that ran through it to "rel=nofollow". Possibly you can slowly convert those links back to normal, but I know for a fact that any major transition will trigger an instant penalty.
I watched a competitor switch to raw links once and Google stomped him into oblivion for about 2 years. I had an accident once that triggered a similar penalty, but knowing what caused it, I was able to get out of it in 30 days.
Just thought I'd warn of the dangers because any time you switch linking schemes you could end up paying a price that may not be worth it just for using Google as a link checker.