I'm going to start adding descriptions, recommendations and random thoughts. If you think I get something wrong please tell me.
Anyone said PathPix yet? Downloadable trial version, same guy that did the iPhone version (http://krispixton.com/PathPix/download.htm) Online version, not the same guy but the gameplay is identical (http://www.conceptispuzzles.com/index.aspx?uri=puzzle/link-a-pix)
Some updates, but still in progress, been a bit busy. I had fun trying these and found a couple games I liked. Give it a shot, and please keep the recommendations coming.
Found a new one! Shockwave.com has a daily jigsaw feature that they turned into an iphone game. Havent tried it yet, at work. http://www.shockwave.com/online/jigsaw-games.jsp
Thanks for the suggestion, but it looks different enough that trying the flash would not give you a good idea if you want to buy the iphone game.
Added iparkit!, where you, you guessed it, park a car. http://www.addictinggames.com/parkinglot2.html I am out of room and did not reserve any slots. The intro paragraph will go first, but we may need to break the downloads into a separate post from flash games.
I see you've already got the Peggle trial listed, but I thought some people might like to know there's also a full (but smaller) version that's free, the Peggle: WoW Edition. http://www5.popcap.com/promos/pegglewow/
Orbital and drawrace both have free but funcionality limited flash demos on their respective websites.
Frogatto - http://www.frogatto.com/download Windows, MAC, and iPod downloads... the PC and MAC copies are free...