Planet13 - 5:15 pm on Mar 25, 2011 (gmt 0)

For best results, make sure you use 301s in a technically sound manner:

Having just done something similar, I cannot emphasize this enough.

Oddly enough, when I messed up some 301s, I was NOT able to recognize it from my server logs. Instead, I only found out about them after a week or so in my webmaster tools admin.

so I would kindly suggest don't just rely on your server logs to find mistakes.