i myself only use web 2.0 and social bookmarks as my tier1.
for web 20, i use:
well written articles (spun-readable)
each web 20 has 2-3 articles
each article has arround 1000 words length.
only 1 article has a link to my money site. using domain url as anchor.
get social bookmarks to web 20 properties.
Leave them indexed naturally - althought it will takes longer....