PiciShare is an alternative search engine for Flickr to your average Flickr Search. The search engine provides a simple click and search interface that enables you to modify the search preferences more efficiently. You can select the search results per page, sort by: relevance, Date Posted (ascending), Date Posted (by description), Date Taken (ascending), Interestingness (ascending) and Interestingness (by description).
PiciShare runs off of the Flickr engine and is advertising-supported as you can see by the screenshot. It looks like a good alternative to Flickrs simple and advanced search engine. Check it out at PiciShare
If you're in to flickr searches and have a blog or website, check out my post about how to add a custom flickr search to your site.