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This is only a short post to speak about two free awesome applications which I considered essential (especially the keyboard one) to perform sysadmin task from remote.
I've tried a lot of them, and finally I decided to stay with Android Terminal Emulator, is fast and clean, and works well on my SGS.
Well, for those like me who can't edit text without vim the first problem to face when editing from mobile is the difficulty to digit special characters like ESC, CTRL, TAB and so on... Here comes Hacker's Keyboard, an awesome keyboard which in landscape mode looks just like your desktop keyboard. i can't live without it. Moreover it supports all the AnySoftKeyboard language packages.
With an ssh client, a good terminal emulator and the best keyboard in the market (at least for me), I'm able to debug, launch services, edit files and much more on my remote server without pain.