The Scotland international blasted home an 83rd-minute winner from the spot to silence a home crowd who were still celebrating a strike from new signing Stephen Dobbie that looked to have secured a point.
Hesitant defending from both sides played a huge part as five goals rained in, with Albion striker Roman Bednar grabbing a brace to cancel out Keith Southern's opener and hand the visitors a 2-1 lead at the break.
The victory takes the Black Country outfit above Nottingham Forest into second place and just three points behind leaders Newcastle, while Blackpool missed out on the chance to climb into the play-off places.
Friday 05th February 2010
Newcastle v Cardiff City 19.45
Saturday 06th February 2010
Barnsley v Watford 15.00
Blackpool v Leicester 15.00
Bristol City v Coventry 15.00
Doncaster v Reading 17.20
Ipswich v Middlesbrough 15.00
Nottm Forest v Sheff Weds 15.00
Peterborough v QPR 15.00
Plymouth v West Brom 15.00
Scunthorpe v C.Palace 15.00
Sheff Utd v Derby 15.00
Swansea City v Preston NE 13.00