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What kind of pages get indexed?

Pages must be simple in design. Simple HTML, non-commerical sites are preferred.
Pages should not use much scripts/css for cosmetic effect. Some might squeak through.
Don't use ads that are intrusive (such as ads that appear overtop of content).
Don't submit a page which serves primarily as a portal to other bloated websites.
Avoid submitting multiple tens of pages from one person's website.
If your page does not contain any text or uses frames, ensure a meta description tag is added.
In most cases, only the page you submit will be crawled.

Note:

The WibyBot (172.93.49.252) is occasionally rejected by some web servers.
Barring technical issues, if you are puzzled why a site wasn't indexed, reread the above guide.
Angelfire and Tripod pages are no longer grandfathered (ads are too intrusive).