Look at ebay # 181376698058 for $80 and I added a 64 gig SD card from B&H Photo. Then I installed Sven Ola's "Debian Kit" which is on Sourceforge. No huge blob or anything. It installs into a file or partition so I've got it running in a 40 gig partition. It starts from a script that mounts the partition and launches the kernel. Android is still running, it just coexists with Linux.
I had rooted the phone first and I have a terminal emulator, ssh server, vnc client which are Android apps. There's a branch of Debian for these, I can run Synaptic and pick from 35,000+ programs to install. It would be nice to do this with OpenBSD instead of Linux. I've had it a month and still haven't made a phone call. -- Credit is the root of all evil. - AB1JX