I was reminded tonight about someone I met last year who spent so much time in networking meetings that he never had any time to follow up. In fact someone at the same meeting told me not to refer anything to him as he was unreliable. The more networking meetings he attended and the more people he met the worse his reputation was getting!
Make sure you put enough time in the diary to follow up. Especially those you have promised something to. It's the beginning of that all important process of building a relationship.