I have 1gb of ram. I don't like not being able to rename/delete/move mp3 files while they are currently playing.

Do they get loaded into RAM to be played? How does foobar do this? The ipod loads the next 4 songs into RAM, it seems like this type of setup is ideal for foobar as well. Does it do any of this?

Deleting/ changing file which is currently in use may mess things badly and IMHO should not be allowable in any software.

"Preferences|Playback|Full file buffering" should do the trick for you.

i set it to buffer up to 102400 KB (100 megs) and I play ape files from 60-130 mb, but my RAM usage doesn't increase.... foobar is only using around 30 mb

Blame it on Windows then, because the rest are probably loaded into virtual memory.
Did you disable executive paging?

For those who really, really want this, I suggest moving to a *ix like Linux or one of the BSD's; the filesystems there allow you to move/remove files under any application, without breaking the apps themselves (they get to keep their filehandle pointing at what they originally opened, so nothing disappears under them).

Of course running fb2k under WINE isn't exactly optimal, but if you really want to be able to do stuff like this...

A more sensible approach would be to write a plugin to have foobar handle such modifications; like with tag updates, it could wait until the file's not in use before moving/renaming/etc.

Anyone up for writing foo_explorer?