uTorrent 3.3.1 Beta 29689

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Micro-Sized, but Feature Filled
Most of the features present in other BitTorrent clients are present in µTorrent.
Resource-Friendly
Unlike many torrent clients, it does not hog valuable system resources - typically using less than 6MB of memory, allowing you to use the computer as if it weren't there at all. Additionally, the program itself is contained within a single executable less than 1 MB in size.
Skinnable and Localized
Various icon, toolbar graphic and status icon replacements are available, and creating your own is very simple. µTorrent also has support for localization, and with a language file present, will automatically switch to your system language.
Actively Improved and Modified
The developer puts in a lot of time working on features and making things more user-friendly. Releases only come out when they're ready, with no schedule pressures, so the few bugs that appear are quickly addressed and fixed by the user.