The combined systems (hybrids). Some search engines, such, for example, as Exite or Infoseek have at themselves and the catalog. Respectively, indexes for the most search engine are got by Spiderom, and the catalog is replenished with moderators of system.
Making the analysis of the published messages, you can find your potential clients and contact them directly. And, at last, it is worth to remember that besides own promotion specialized discussion lists are extremely useful as will supply with valuable information and news.
It is desirable not to use the signature consisting more than of 6 lines (including dividing lines). The big signature containing advertizing can be negatively apprehended by the recipient, is regarded as a persuasive way to declare itself. The moderator of conference can remove too long signature etc.
Animation use. The movement attracts all eyes. The same concerns and the animated banners. Statistically the response from them is 25% higher, than at the static. The most difficult here - to achieve the maximum showiness at the small size of the file of the image.