Recently, I've stumbled upon the MadMouse Directory. This directory is unique in that it offers spam free paid submissions, and it is human edited. Submitting to this web directory will invariably improve your link popularity, as it boasts a page rank of 3, and employs search engine friendly URLs. THey also feature deep link features, and they provide multiple deep links when you purchase a featured listing. Another nice feature is that all listings are provided with a page rank indicator. If you are looking to boost your page rank, check out this up and coming directory.