Raf (link down) has released his version of FTPD for the PSP, heres the info:
I'm releasing a new version of FTPD (based on pspkrazy's 0.21). All this hack really does now is allow you to configure your own username/password in a config file. It's also compiled against the latest SDK/toolchain (svn r1024); and has some other small fixes/etc. Nothing big though. But if you're concerned with security; then this may help a bit. I include eboots for 1.0 and 1.5 (although I haven't tried it on a 1.0 psp), and also all the source code. I updated also libnet a bit (using pspvnc's and my own changes), but it's still far from perfect..