Originally Posted by Antonio

This is more or less what I am thinking of doing as well, but just developing the sites and selling them. I totally agree on the adsense part, not that it can't ad up, but with the number of accounts that they are suspending left and right, it is way too rusky...

And I might as well contribute a bit to the thread as well - this is what has been working quite well for me:
on an aged site:

- I find a low competition keyword related to the site's niche
- add a new post, targeting that keyword
- do 100 or so bookmarks with Boookmarkin Demon
- create 20 or so Web 2's with SE Nuke
- blast the heck out of the Web 2 with all I got (article links, profile links, you name it)
- do some contextual links (I use AMR and wordpress blogs that I have in my list)

I see results almost immediately.... Of course, you can outsource all this instead of doing it on your own, then just rinse and repeat. The link-selling is pretty good idea - it can help you recover some costs and make money even if you can't sell the site.