earn cridibility with google, get backlinks from sites google likes. And Google will fall in love with you as well.
If you've got $300 to spare buy your way into Yahoo!'s directory. I don't know how it will do in the long run but Google seems to like us a lot more since we did it.
Accurate alt tags for images. Ever since I started fluctuating how I name images, I've been receiving a ton of traffic from google images.
Besides "Don't Eat Yellow Snow" I'd say, spead your efforts as wide as possible. Don't count on any one method to continue to bring you traffic. Search engines keep changing things that once worked no longer do, if you are spread over many methods the loss of any one method will not affect you as much.
if I use a trusted (ie, old, not sandboxed) site, I can throw tons of crap-links at it and it'll still rank well in a hurry. I don't think there's anything particularly wrong or harmful with low quality backlinks. if there was that'd obviously create a bit of a problem as it'd make it so easy to hurt your competitors. the only time I'd be cautious about it is if you can't afford losing your domain's trust with google, or you're praying that getting only quality links at the right pace will somehow make the sandbox disappear. I've personally never had either happen, though. so much easier to buy established domains / sites and build on them than it is to try to beat the sandbox / lack of trust.
1)Good navigation or a site map. 2)Run it through a html validator http://validator.w3.org/ be sure all major errors are cleared. minor ones like no alt text and such will not stop you from being indexed
"Linkbait" using quality content, tutorials, tools, articles and so on, all industry based or for educational purposes.
probably can't call this an SEO method but in my opinion the best way it to pay a good SEO company to search optimize your pages. They're doing this as thier main business so it figures that their much better at it than most of us.
My favorite SEO tip is from Mystique... "Never waste your time reading SEO tips, and move on" Even though there are good ones, nowadays everybody claims to be the owner of "the ultimate SEO guru"
Marketing sites based on the intent of the search engine rules, not necessarily the rules themselves. IE Google frowns on link buying, however if I put a quality, relevant site in the top 10 using any techniques necessary, then I have satisfied the intent of the rule.