In case you've been in a coma, living under a rock, or have been recently resurrected, Modern Warfare 2 (aka. The Biggest Game of 2009) is pretty much the reason why everyone is so up in arms about the recent furore concerning big, bad publisher Activision and mouthy developer Infinity Ward. It's a big, fat, shiny shooter that plays and feels like a sublime slice of Hollywood action movie bliss, although it is a bit short.
Nevertheless, if you've somehow missed out on all the teabagging fun to be had with this sturdy FPS, you might want to check out The Hut as they're currently listing the Hardened version of the game - the one that comes in a steel case, with a hardbound artbook and a full downloadable version of Call of Duty Classic - for £37.93, which is a good £2 cheaper than the next guy (Amazon).
EDIT: Remember to apply the X10 voucher code at the checkout, and save yourself another £3.79 by bumping the price down to a very pleasing £34.14, resulting in a total saving of over £5 against the nearest competitor!
The big draw over the standalone version here is the addition of Call of Duty Classic, which itself is worth around £10, especially if you're looking to pay via Games on Demand. It's good to see that this has fallen in price so quickly and, considering that the standalone version of the game is still up above £30 in most cases, I'd say that if FPS games are your thing, this is definitely the version to go for.
I'll say it straight: Modern Warfare 2 is a very good game. It thrives on setpiece action, cinematic gameplay and tight controls. The multiplayer is excellent, as you'd expect, the Special Ops modes offer some brilliant co-op fun with a mate, and the single-player is a wonderfully crafted experience. It's pretty linear, but then again I don't mind that in a game. Too often, developers choose to offer a more open, expansive experience simply because they can't pull off the intense level of focus and attention to detail required. Linearity in this case is a mark of confidence: Inifinty Ward have created a good, if somewhat over-the-top, action romp, and they want to show it off.
I'd let them if I were you.
Thanks to Adam2050 at HUKD