Vote for Xbox 360, Sky+ HD, iPhone or TomTom as Greatest Gadget by Sunday

Britain may be turning into a frozen tundra, but our search for the Greatest Gadget of the 21st Century continues apace and you have until midnight on Sunday to vote.

This week is absolutely key as the result decides which two gadgets will face off against each other in the grand final of the tournament next week. You heard us -- the grand final!

There are two battles that need to be decided first. First is the closely fought TomTom Go Live sat-nav and the Apple iPhone. At the time of writing, there were just a few votes between the two, so it's worth visiting this page and clicking on the product you think should win. Your vote could make all the difference.

Next up is the Xbox 360, which is staring down Sky+ HD. This one looks to be going all Xbox's way to be honest, but anything could happen. 

It's worth taking part. Every time you vote, you'll be entered into a draw to win an amazing prize. Up for grabs are an Arcam rCube, a BlackBerry Bold 9700, a Sony Ericsson Xperia X10 and a MiFi from Three or one of ten Idapt i4 multi-gadget chargers. 

Go here to start voting by midnight on Monday, and we'll see you on Monday for the grand final.