On the Web: An E-Commerce Holiday Checklist, Part 1

Navigation and Internal Navigation
Site search is one of the most difficult things to master. Start by looking at the top 100 searches conducted on your site this year and make sure those words are better represented in your navigation.

It's important to remember that the order in which you present site search results is critical to your success. Take that list of 100 top searches and conduct them yourself, one by one. Review each result. The item you most want to sell should come up first, with the rest in descending priority.