co.uk</a> and Play.com are arguably the two biggest online retailers of entertainment products in the UK. Both companies have been showing Playstation 3 exclusive Killzone 2 as their top seller for some time. The game has lingered in the top 10 of Amazon's top 10 hourly sales list for a good 2-3 months now.

Furthering predictions that Killzone 2 is in for a bumper first week of sales, US retailer Gamestop are said to be holding a series of midnight launches. Midnight launches are usually reserved to those games with extremely high preorder numbers.

It will be interesting to see whereabouts Killzone 2 lands in the sales charts.