Protein shakes

[mcmiller]

You'll find that technique is by far the most important part of gaining muscle mass.

Start with the basics first.

+2 I'd say there are 2 more important parts you have to include as well i.e. intensity and the type of exercises you are doing. You should be doing full body exercises squats, dead lifts and clean and presses as your main workout.

[Twirl]

Maximuscle was recommended to me by quite a few people so I'd go with that.

[Knightwalker]

Used myprotein.com as well, but bear in mind they are not dispatched in containers, so you may want to keep an old container to store it in.