Some great advice you have been given so far bud.

As Bec said, make sure you have some niche linking in place, either in a navigation panel that is mirrored across your entire site or, as part of a link footer on the base of all your pages.

If you use a link footer, you could include the niches using SSI or PHP this way you can use the same links on every page and if you decide in the future to change the niches, you will only have to edit one file.

Regards,

Lee