Keywords in your own subpages and subdomains also help. Your subpages especially should always have a descriptive title.
Title Tag - arguably the most important SEO tag for any website. Google supports approx. 60 characters in the title, while Yahoo allows for up to 110 characters in the title. It is important to target the most critical keywords in the Title. Every page should have a unique Title. META Description Tag - These were once important but are no longer. Some engines do display the description defined, while others do not. Some search engines do read the description tag, and do utilize the content found within in the ranking process. Google, MSN and Yahoo give very little weight to no weight for these.
Try to offer valuable information or tools so that other people are motivated to link to your site. This will increase the chances of natural backlinks.
