The Bakerloo line is now joined by the Jubilee, Metropolitan, Northern
and Victoria lines in having 'live' ETA Boards (the Tube equivalent of
National Rail's Live Departure Boards).

There's web, WAP and PDA versions available.

web - http://www.tfl.gov.uk/tube/travelinfo/eta/

WAP - http://www.tfl.gov.uk/wap/eta/

PDA - http://www.tfl.gov.uk/pda/


And "more lines [are] to follow in the next few months".