Starting point?
Proxy.
Mail (hushmail, mailvault, ziplip etc.)
More mail: don't get stuck with one mail address, and keep no backlink.
Handles: don't use one handle all over the place, and don't connect them to mail. Style: change.
Posting pictures: apart from the obvious hosting track, you may post stuff that gives your identity away. If you look back a bit, you'll find pics I have posted that show a full screenshot, showing the menu of links I use often. If I was concerned with hiding, that wouldn't happen. That sort of knowledge will let someone with a warrant track use patterns.
Just a start, but it should be enough.