Ramires, Odemwingie and Yaya Toure.
Ramires - I was always a fan, but he looked more like a marathon runner than a footballer and I did question whether he'd have enough about him physically to make an impact in the centre of midfield at one of Europe's best sides. He started off fairly well, started to fade a bit midway through the season along with the whole of Chelsea FC and for some reason as an outsider looking in he seemed to be getting more criticism than most (probably because he was an easy target as the new kid on the block). However, he's turned things around now and IMO has been one of their best players during the resurgence. Cracking player.
Odemwingie - I actually didn't think he'd have too much of an impact in the Premier League as I'd always (wrongly) thought of him as nothing more than an average striker, but he has certainly proved me wrong. Suffered awful abuse in Russia so it's good to see him happy and enjoying himself now and he's certainly feared among Premier League defenders. A bargain at £2.5m () and he's ahead of Hernandez as the signing of the season IMO.
Yaya Toure - One of my favourite players. Really enjoyed watching him at Barcelona and at international level as I love his style of play. A ball winner who has excellent distribution, plays box-to-box and has an eye for goal too. He cost a lot of money but it's pocket change to the Manchester City owners anyway. Fantastic player and I'm glad I get to see him playing week in, week out now.