I've released version 0.4.0, the extra version bump reflecting the addition of a major new component: filesystem drivers. rEFInd has been able to load drivers for a while, but obtaining them has meant tracking them down from alternative sources, and possibly splitting "fat" binaries into their consituent parts for use on non-Mac systems. I've finally managed to get a number of drivers to compile in a sensible way on a Linux system, so I'm now including them with rEFInd. Currently, the drivers are for ext2fs/ext3fs, ReiserFS, HFS+, and ISO-9660. It's no coincidence that those are the drivers provided with the original rEFIt and with VirtualBox, since those are the ultimate sources of all of them.

Mac users should be wary, though; I've been unable to get the drivers to load on my 32-bit Mac Mini, and I suspect the reason is that something about the build process requires a UEFI 2.x, rather than the EFI 1.x that Macs use. You might get lucky, though, and if not, you should be able to use the original rEFIt drivers, at least for ext2/ext3 and ReiserFS.