Thanks for the suggestions. I've got a couple loose requirements for my list for additions:
-It has to be a specific game. 'Avalon Hill' games may be useful generally, but it just isn't the kind of list I'm making. And a quick search of Avalon Hill on eBay isn't too impressive (maybe I've got something wrong?)... which leads to...
-It has to be common enough to show up on eBay from time to time. This is a loose rule, but makes the list more useful to craphounds and beginner collectors. Yeah, this means I should take a few things off my list, but I like having a couple of the more 'grail-like' games around a la Akalabeth.
-Some of the games on the list are there because of personal affinity, not necessarily a lot of value (e.g. some of the monkey island games). I may remedy this as I go.
-If the game is for Mac only (or even C64, etc) that's fine, but please note that for me. Also if it is only the Mac version that is worth much, and not the PC version (or vice-versa) that'd be good to know, too.
Applying that to the above suggestions, and Bad Day on the Midway might make it (Freakshow doesn't appear to be worth much), but 'Avalon Hill' is too vague and I couldn't find the rest (and haven't otherwise heard of them in order to add them anyway).
Hope that doesn't sound harsh or anything, that's not my intent. Its just every list has to have some criteria. I threw up those 41 titles without even trying: obviously any 'PC' game list will get too big very fast. I'll limit this one to 50 at the most, and may pare down to 40.