I use the website torrific.com to download my torrents. How it works is, you give the site the torrent file and it will download it from the seeders. Once the download is complete you can use your browser to download the file via HTTP. The main advantage I find in it is if other user of the site has already downloaded the file, I don't have have to wait for the torrent to complete download. Rather I get the HTTP link instantly. It uses file has to check if the file has been downloaded.
What are the sites of similar nature you use?