I needed a specific look for shot I was working on last night. I found this site and it has a great roundup of filters and plug-ins. Check it out if you are looking for a single place to see lots of filters.
Photoshop Filters, the complete freeware and commercial source.: “This site is all about Photoshop compatible filters for the PC. As you browse the site, you will discover over 300 pages packed with thousands freeware and commercial Photoshop filters available from the best authors on the Internet. Each page displays the ‘Master Image’ of the lion and the result of each Photoshop filter has on the image.”