I've found suitable replacements for some of the programs, but not for the others.
MacWrite: Pages. When I first used the original version of Pages, I immediately thought of MacWrite Pro. I liked MacWrite because it didn't have the bloat/unnecessary features of a larger word processor (Word/WordPerfect) and now use Pages for the same reason (although I do keep Word around just in case I need something more powerful).
MacDraw: I still can't find something I like as well as MacDraw II for simple page layout. On occasion, I still fire up an old Mac whenever I want to design a form or create a study guide simply because of MacDraw II. (Exporting to a modern format is a multi-step process, but I get the job done). Pages does work reasonably well for the basic draw features, but I'm not ready to say it's a replacement.
FileMaker II: This database program was awfully simplistic, and that's why I liked it. I never needed the power of FileMaker Pro to organize something simple (such as an inventory of the books I use for tutoring or the Mac parts I have on hand). Many of you have probably heard of Bento, and I've found it gets the job done when simple databasing is all that's required. It reminds me somewhat of iWeb in the fact it's not geared towards a power user, but for a casual database user, it's more than adequate. Bento also comes with a lot of nice templates.
Kid Pix: There actually is a modern version of Craig Hickman Kid Pix, geared at a far older audience. It's called Beautiful Dorena and is available free of charge from Craig Hickman's site. There's also a new Kid Pix 3D out there, which I purchased for my four year old second cousin. Early reports on this program are good and I hope to play around with it as well so I can stay current with this perennial favorite of the schools. (To me, catching up with recent educational programs is a lot like taking continuing education--you've got to do it if you want to maximize the value of the technology in your lessons).
New Math Blaster Plus: I'm still looking for a consumer-level product that has as much flexibility as Math Blaster Plus, where one can track student progress and use customized sets of problems. This is a favorite of mine when I tutor children individually, as I can tailor it to their needs. The "correct answer" sound is also good for when I'm timing students, as I can tally incorrect answers easily even if I'm not looking at the screen (since the computer won't beep). (The students also love the trackball of the PowerBook 150 I use it on; it's a new concept for most of them). There are some web-based programs out there, but I prefer something I can use offline in case I'm somewhere without wi-fi. The newer versions of Math Blaster are OK, but play too much like a video game to be ideal for drill.
The Appearance Control Panel from OS 9: I'm still waiting on this one for Snow Leopard. I wish someone would update the old ShapeShifter program--I'm sick of blue and gray and want to try ParcPlace (the TT font mentioned in another recent thread) as my default font.