Presumably. But only Access knows. So far it appears that apps with arm code won't run, at least it appears to be so, while traditional m68k apps will run (most apps are still in this format). I've also noticed that the more apps you load into GVM the slower it is to start up, and maybe also to launch applications. If there are new versions coming then this is probably the easiest to fix - right now it scans the whole image file (where apps and data are stored), it should be simple to add an index- or hash function for faster lookup.

A very interesting question. I have not tried. I forgot my N800 today so I can't test this right now.

It can run 320x480-enabled applications, yes. What it cannot do (that I know) is to run these applications in landscape mode, that is, in Palm landscape mode. GVM can be set up to run the Palm apps in either N800 portrait or landscape mode, but that's a different thing.

Lastly, I don't think the N800 is heavy, compared to my Palm T3. I have never touched a TX, but there's more plastic in the TX than in the T3 I believe, so the TX is probably lighter than the T3. There have been pictures posted here (or links to, at least) with N810 vs N800 size comparisions.