Have you checked out a site like http://www.myfitnesspal.com/ ? While it's certainly more catered towards folks like me who are trying to lose, I know there are people on there trying to gain, and I just took a quick look at site tools again, and I do have the option to get a suggested calorie intake to "gain weight" instead of losing.

May not be what you're looking for but still may be worth a look? Good luck, regardless.