Thank you for the info and huge resource. When you look for good ways to get backlinks on Google, you always find loads of sites helping you with link exchange. Link exchange is not worth anything anymore as far as I'm concerned.
It is very consuming even when you use link exchange management softwares, and not rewarding. Then you have to check that sites are still linking back, make sure they don't use nofollow links etc etc etc...
And anyway google doesn't like it. Three-way link exchanges are a little bit more rewarding but still... I don't bother anymore with link exchange. Always go for one-way links, the ones mentioned in this thread are some of the good ways to get good rankings through backlinks.