People love to help out.
When a friend needs help most people are more than willing to lend a hand. But if you ask someone to help you move more than once in a twelve month period you are gonna wear out your favours pretty quick. If you are asking people to spot you for lunch every other time you go out, you are gonna run out of lunch dates pretty quick.
The secret is to offer help more often than you ask for it. Offer help twice beofre you ask for a favour. Be generous with your time before asking others to be generous towards you.
I may sound like a New Radical here but You Get What You Give. If you give your time to others you will get their time in return. If you take peoples' time but never recipricate, you wind up with having to constatly find new people to leech time off of.
I guess I'm just stating the golden rule. Treat others they way you want them to treat you. Do this and pretty soon you got a wicked team of people just working for each other to get great stuff done.
Anything I can help you with? Let me know and I'll do my best to help you out.