According to the settings, I have 10.03GB Available on Internal Storage and 14.91GB on External SD card. Also, the "Unroot" option is available in Gingerbreak.
I tried the "BusyBox Installer" app too. It installed, but then failed to install BusyBox due to no root access. Tried it again and it worked. And now Titanium Backup seems to be working too.
Maybe because i forgot to turn the rotation lock off??