I think time comes for torrent client.
I inspect some torrent clients and decided "transmission" because it written with C language that means CPU usage will be small.
And it already using at some embedded systems, can run as daemon supports both Web and CLI interfaces...
Tool requires OpenSSL libraries too.
Who wanted to port this tool?http://www.transmissionbt.com/
And debian already has this toolhttp://packages.debian.org/squeeze/transmission-daemon
but I prefer fresh compilation for our environment and cpu.