µTorrent is an efficient and feature rich BitTorrent client for Windows sporting a very small footprint. It was designed to use as little cpu, memory and space as possible while offering all the functionality expected from advanced clients.

Features:

- Multiple simultaneous downloads
- Smart bandwidth usage
- File level priorities
- Configurable bandwidth scheduling
- Global and per-torrent speed limiting
- Quickly resumes interrupted transfers
- UPnP support (WinXP only)
- Supports popular protocol extensions
- Localized to different languages
- Typical memory use less than 4 MB
- Incredibly small: 92 KB

Download: µTorrent 1.1.5