When I was a kid I was on something called 'Polycose powder'.. its just a supplemental calorie powder that you can mix into anything... mashed potatoes, gravy, smoothies, etc. It worked out pretty well for me and its mostly tasteless. I'm not sure if they have an improved version of that now or what, I'm sure someone here knows. <img src="i/expressions/face-icon-small-smile.gif" border="0">
Sadly I don't really think there there's any 'quick fix' for weight... you just have to eat, and eat a lot. Someone in another thread said her bf was on 'hungry pills' so maybe you could even look into something like that, if your appetite is a problem (megestrol acetate).
Personally I have no more weight issues, I'm 5'2" 120~ish lbs, so definitely on the more 'meaty' side of a CFer lol. I think it partly might be due to genes (my mother is heavier) and partly due to the way I eat. I don't snack on 'snacks' I simply eat a small meal as a snack. So during the day I consume lots of random hamburgers, turkey sandwiches, bowls of soup, etc. The 'snack' type things I do eat are also pretty dense themselves, usually chips, jerky, nuts, vegetables with dip, olives, cheeses with bread. Also try getting up and making sure you get in all your meals. Have a nice big breakfast if you can... that's what seemed to make a difference for me in college, I gained a bit of weight there too.