What’s the current trend in SEO?

Question From User - Answers in Comments.

I want to promote and brand my website to survive in the SEO world. My ultimate goal is to drive quality traffic (don't want junk traffic) and to grasp more customers through goal conversion.

I have already tried Advanced SEO tactics like

1). Community Creation in Social Networking (Web 2.0 - Participatory Web)
2). Blog Posting & Commenting
3). Guest Blogging
4). Link Baiting
5). Cross-Linking (Internal Linking)
6). Forum Postings
7). Business Listings (Entrepreneur, Industry specific, Business Associations & Chambers Listings)
8). Video Promotions (Youtube, Metacafe, Dailymotion, etc.,)
9). Business Reviews
10). Social Bookmarking (Tagsonomy & Folksonomy)
11). Photo sharing (Flicker, Picassa, etc.,)
12). Answers (Yahoo Answers, Cha-Cha, Answer Bag, etc.,)
13). Document Sharing (Google Docs, Slide Share, etc.,)
14) CSS & W3C website Directories
15). Widget Development

Any suggestions are welcome....

Thanks for your time.
P.S: I have also tried Link Exchange with relevant sites (Thematic Link Exchange)