January is a toughie. Torn between new year's virtue and that rebellious streak? Well, here are some things to amuse you that at least wont tug too hard at your purse strings. Monday: Witch hunts to start the week at Gresham College from 6pm. Free knowledge. Tuesday: Are you a tech geek? Are you interested in search engines, the internet and web technology? Do you need to make more friends? Well, pitch up for......