Chris A. from Erie, PA asks:

"I have a server-side script that automatically redirects visitors to a mobile version of a site if they are using a mobile browser. My question is: What are some things to watch out for (if any) when serving different content based on the visitor?"

This video is part of a "Grab Bag" series in which Matt Cutts, head of Google's webspam team, answers questions from webmasters. We're not currently taking new video questions, so your best bet for getting an answer about webmaster-related search issues is to head to our help forum: http://www.google.com/support/forum/p/Webmasters?hl=en