I love Popcap, my siblings and I practically grew up on their games. Well, them and Big Fish Games.
Astropop - Used to play on Steam, but it was so busted I play it on the PS2 collection now.
Chuzzle - Too old/janky to work well on Steam and a bit boring, but I always liked it.
Dynomite - I still play this one. This poll is making me want to go a round or two!
Iggle Pop - I beat the whole game in one go. I liked it, very frantic and a fun story.
Insaniquarium - I was happy with the fish I've earned and don't put any more hours into it.
Peggle - I picked Peggle over Peggle Nights. I remember enjoying the original way more.
The Wizard's Pen - Really easy for me, though I really like the graphics in this one.
Venice - I forget if I actually finished this one. It was pretty challenging and fun though.
I actually own all of the above on Steam! My gramps had most of these on his old computer and I would play them all the time back then when he brought his work laptop home. So me buying them on my Steam account to keep them around on my PC was a no-brainer.
I played these two on those PS2 Popcap Collections with Cosmic.
Bejeweled 1, 2, and Twist - I've played Bejeweled just about everywhere. I even played the two mobile ones, Blitz and Stars.
Heavy Weapon - Incredible fun, I can second that. It was so idiotically patriotic that it was hilarious. I like the upgrade system too.
Plus it was just really fun to blow up the huge bosses with all the nukes you'd been saving the whole level.
Never heard of or played Escape Rosecliff Island, though. Looking into it, it reminds me of Ravenhearst. I have that on my Steam and 3DS.