I also have very fine hair. It really likes the more natural products. I went from being a winter wavy/3a summer to a winter of the curls in my signature picture as a result. The turning point was starting to use soap bars to cleanse after 6 months of cowashing. It tightened curls and added volume. My most commonly used products, like the others, are in my signature.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; DM MiraCurls Curling Gelly; UFD Curly Magic; Shescentit LIs; Sevi conditioners; Botanical Spirits Puree, CJ Repair Me