Vico is a Mac OS X text editor with Vim-like keybindings.
If you want to try tiling window managers + Vim, your best bet is to use MacPort to install gvim and either wmii, awesome or ion3. Other WMs worth trying are wmfs, dwm, xmonad… you'll need manual compiling though.
I experimented with an Archbang + wmii setup on my netbook for a few months. I don't see how this app comes close to emulating that experience. I suggest a VM setup.
I think I am going to setup a VM with this. I really want to try the real thing. If it runs well enough in the VM I might just do all my development in and use the host OSX for everyday tasks.
I am looking into getting into Android development. Is it worth doing it without using Eclipse?