Off Page Search Engine Optimization Activities

Directory Submissions: Dmoz, Yahoo etc.
Article Submissions: Ezine.com, goarticles.com, buzzle.com, articlebase.com etc.
Press Release Submissions: PRweb, PRleap, Pressbox, Indiaprwire.com
Blog Posting: blogspot.com, worldpress.com, 360.yahoo.com etc.
Video Submissions: youtube.com, video.aol.com etc.
Forums Posting: Publish your views in related discussion forums.
Comment Posting: Give comment on related blogs, articles etc.
Link Exchange
Social Networking Websites:
1) Social Book Marking: Digg.com, del.icio.us, Furl, Simpy etc.
2) Ask and give Answers: answers.yahoo.com, answer.com, ibibo.com, answerbag.com etc.
3) Create wiki having details and services of websites: wikipedia.org, wikispaces.com
4) Create community of people having same interest: myspace.com, orkut.com, facebook.com, del.icio.us, bebo.com
5) Create micro blogs: tiwtter.com, squidoo.com
6) Post Free Classifieds ads: classifieds.yahoo.com, classifieds.sulekha.com