I had rounded up a list of almost every search engine on the Web including top tier, second tier and some really out there search engines that allow you to submit your site for free as many of them have limited crawlers and may or may not ever find your site. Below is that list with the engine name and a direct link to the submission page:
Guaranteed Inclusion in 10 Search Engine Databases
and 10 Associated Web Directories!
Click Here – Rapid Inclusion in The Search Engine Network
Automated free search engine submission resources (includes some web directories and niche search engines):
300 Search Engine and Web Directory Submissions – Link
170 Search Engine and Web Directory Submissions – Link
150 Search Engine Submissions – Link
140 Search Engine Submissions – Link
140 Search Engine and Web Directory Submissions – Link
130 Search Engine Submissions – Link
100 Search Engine and Web Directory Submissions – Link
50 Search Engine Submissions – Link
40 Search Engine and Web Directory Submissions – Link
21 Search Engines and Web Directory Submissions – Link
20 Search Engine Submissions (at bottom of page) – Link
12 Search Engine Submissions – Link