Thanks to Adsense coming on the scene last summer many domainers have finally seen PPC revenue come from webpages and not just parked domains as in the past.
Google has done a great job overall bringing steady reliable income streams to many websites, one more reason development is the way to go, especially if you are able to sell both adsense and your own product/service on the same site!
Unfortunately, Pool.com's great success in the past year has actually been an overall negative for most of us as only those with deeper pockets can now afford to play that game what with the inflated auction prices. I for one do not bid on auction names anymore as they are so incredibly over-priced due to the auction model, not to mention getting stuck with those bad registrars Pool uses, mostly in Asia.
The sad decline at Snapnames also happened in the past year, they are now so worthless I don't even bother with replacement Snaps for lost ones still active, as replacing them means work with almost zero chance of success. Now I let the Snaps expire with an empty Snap.
Probably the most surprising change in the past year for me is to see a number of my sites get increased traffic (i.e. 4/week to 40/week or so), with no obvious explanation for it, they may have the same G Page Rank and no better SEO work, or even lower SE rank or zero PR (in some cases) but better traffic - very odd.