Sorry if this has been mentioned before, this is also my fist deal. I went iinto my local Blockbuster last night and I saw this deal. It said that for a limited time only, they will accept ANY PS3 game as a trade-in, and you will get £30 off any new PS3 game. I thought this was particularly good to say that I bought NHL2K7 from Play.com for £17.99 - I weren't too keen, so I took it to Blockbuster and saw this deal.
Like I say, it's my first deal - so please don't be too harsh on me :)