There are a number of plugins for Firefox that I use regularly to schedule regular refreshes on pages like Google Finance that I like to keep current throughout the day. In its infancy, Chrome does not have a built in way of doing this.
I found a nice solution here on a forum, posted by user gl0rfindel. Create a bookmark pointing to the url:
timeout=prompt("Set timeout [s]");
fr4me='<frameset cols='*'>n<frame src=''+current+''/>';
Clicking the bookmark will let you specify how regularly (in s) to refresh the current active tab.