Here's my useful marketing link for the week: Online marketing expert Mark Brownlow has written a 52-page guide to how to market yourself and your company through email discussion lists. You can get a copy free here
. Discussion list marketing is one of those great guerilla tactics that's free, effective (especially in niche markets of almost any kind) and really works when you do it right. Of course if you do it wrong, you'll look like a huge a-hole in a fairly public place.