Must-Do-SEO Methods: I must say, Article Marketing is still Alive in the past, today and future...
Article Marketing: Do it Manually (Ezineartilces, Articlebase, & other high PR sites)
Web 2.0 Article Marketing: Do it Manually (Squidoo, Hubpage, Livejournal, Web, blogger & other popular ones)
Press Release Submission: Manually (Select high PR PR sites that you can submit for free!
Social Bookmarking & Netoworking: Manual submissions are preferable (Targeted only about 25 high pr sites like facebook, twitter, youtube, diggo, dig, stumbleupon, etc.
I don't recommend any tools that create spam links for your site as Google is not stupid about scrawling, if it's a must to have backlinks tools, you need to do it in the right way...Remember you are doing long term seo, think about Google Panda, and now penguin, and what about the future...
So be legit to the eyes of search engines esp google. The right seo methods are those that take care of your site for today and also for future....
Oh, I forget mentioning about RSS Feed Submission as well as a big concern regarding your on page SEO!
Hope this help!