Speed Download Lite is simply a stripped down version of Speed Download 5 offering just the download manager - without any of the extra features (i.e. FTP, File Sharing, WEBDAV, etc) found in Speed Download 5. With regards to the interface and browser integration, both Versions of SD offer the same top of the line performance and reliabilty that you'd expect from a download manager.
Speed Download combines four amazing products — a turbo-charged download manager with auto-resuming downloads, a fully featured Secure FTP client, a file sharing utility with full encryption, and complete .Mac/iDisk/WEBDAV connectivity — into one small and easy to use application.
Speed Download also introduces a stunning new user interface option that feels right at home in Mac OS X and is designed to help you be even more productive with fewer mouse clicks hence, completely redefining what you can do with your time online. Introducing SD Minimized mode; a serious upgrade to the Speed Download floater. Fully supports drag n drop, completely resizable, customizable, and a whole lot more. In minimized mode, SD is even more discrete on your Mac. Save screen space, but not power!
Some of the other new features of SD5 include the following:
an overhauled interface with various view modes,
a re-engineered 'Universal' download engine optimized for maximum performance,
a powerful database to manage all your downloads, uploads, and file transfers,
a brand new fully featured, built-in FTP client,
encrypted file sharing between SD5 users,
a high performance utility for downloading web content for offline viewing,
.Mac iDisk integration,
auto-resuming file transfers all the time,
unlimited UNDOs throughout the entire application,
smart folder technology,
and much more!
As an added bonus, Speed Download now includes a link to Transmission; an incredibly well designed Bittorrent application.