Suggesting a site for inclusion is easy. The only thing you have to do, is to  reciprocate with a link back to this site.

Just send us an e-Mail with the text "Add URL" in the subject line.
In the message,
1.  Write the complete and exact URL to the page you wish to include;
2.  Mention in which section(s) of our library you wish the page or site to appear;
3.  Write few words about what the page or site is (specialised) about;
4.  Include your e-mail address, and, if possible, also the e-mail address to the webmaster of that page or site (if that isn't you);
5.  Include the URL(s) in where we can find the link(s) back to us (one for one)

We would prefer, and be happy if you use the link text or banner below, but just any text would do, in your own words.

A resource site for any philatelist: "Collector's Target".  With new stamp issue information, links to all sorts of philatelic sites, postal authorities, libraries, museums, auctions, valuators, dealers, clubs, societies, chat, translator, articles, trivia, free classifieds, free exchange ads, discussion groups, and more.

Or use this banner:

We will check your page or site, and when approved and included in our library, you will be informed by E-Mail - to the E-Mail address you stated. 

Why not also consider to suggest your (or an other) site to our Website Award feature (too)?