URL:

• Mostly spiders will only see the text of your web page.
• Most spiders will not translate any javascript generated text.
• Most search engines will not spider framed pages very well.
• If the page deals with baseball, then try to have a high keyword density of baseball related words.
• Some search engines will give you a lower ranking if you have hidden non visible keywords on the page. The will sense that you're trying to fool the spider.
• Don't just include a huge list of keywords. Having some actual sentence structure is better.
• You don't have to register each web page of your site. If your pages have links to the other pages then the spider will eventually probe the entire site.
• A great pair of sites to visit to learn about spider friendly web page design are SearchEngineWorld and SearchEngineWatch.