Get your name out there. The net is full of lists. Un-moderated lists enable you to use your signature file. The amount of acceptable lines for signature files vary greatly from list to list. Read before you post.
Some lists have several posts a day.
This can be extremely annoying, but there is a digest form for most of them. Don't spam a list. Spamming is ineffective, it's a nuisance, and it will damage your business reputation. We've developed a barrier to ads. We're exposed to them all day long, every day.