isoHunt is a search engine for finding BitTorrent files that are fully categorized so you can easily find what you are looking for.
Along with BTJunkie, isoHunt is one of the most popular search engines for torrent files. The design isn't incredible - you could best describe it as functional. You can add a category to any search term, making files easier to find, but it is not as user friendly as BTJunkie, and search results are harder to modify in isoHunt. However, there's a neat new release tab for browsing new torrents, and you can filter them by age.
Like many similar web apps. isoHunt's biggest problem is it doesn't filter copyrighted material. Users have to use their discretion when downloading torrent files. Torrent files require an app like Transmission or uTorrent to manage downloads.
isoHunt is an effective torrent search engine, although it's looking outdated and needs some usability optimization.