Transdroid is an Android app that support various clients including µTorrent, Transmission, rTorrent, Vuze, Deluge and BitTorrent 6. You can download multiple files simultaneously and monitor their downloading speeds, peers and seeds.
Symtorrent is an open source bittorent client for symbian V3 and V5 mobile phones. You can manage multiples torrent files using symtorrent. It also supports resume capability so that you can complete your unfinished downloads later.
Mobtorrent is is the first and only torrent client for java mobiles. It can download only small torrents due to memory limitations of java phones.