Just to be clear here, as of right now, Ad-Aware 2008 Free (v7.1.0.12) is still a fully functional product and still receives updates to its spyware definition database (if available) when you request them. The latest version of these, which I just downloaded, is 0146.0007.
I realize the purpose of an ordinary nag screen, but in this particular case, the nag in the 2008 Free version is not to upgrade to the Plus or Pro paid version of the 2008 product, but rather to a new updated version of the free edition of it:
This particular update to Ad-Aware 2008 Free can be found
here.
The new nag you mention Exid0r, popped up in the lower right corner of my screen a couple of days ago when checking for definition updates for 2008 Free, but it went away and never returned with a simple click of the "X" on the top right corner of its screen. All I'm saying is, if the Anniversary Edition Free splash nag screen could be made to disappear just as easily, this would not be a bad thing.
As for the incentive for Lavasoft to release free software EmmEff, I can't really comment on this because I don't know what their specific reasons are. All I can do is guess that it's done to provide people with a basic version of anti-spyware software that otherwise might not be able to afford it, simply don't want to pay for it or don't need any of the extra protection offered by the Plus or Pro versions. Obviously their real money would be made from their business customers as opposed to the average single home user, but again I'm just guessing.
The one thing I do know though is based on the reviews of the new "upgraded" Ad-Aware Free Anniversary Edition, I won't be installing it any time soon and, as I mentioned previously, I'll stick with 2008 Free until such time as it becomes obsolete.
As always, thank you to everyone for your comments and insight on this topic.