No matter what application you're in just hit DTerm's hotkey and it'll be there for you.
What could be better than "right here, right now?"
No matter what application you're in, no matter what document you're working with, just hit DTerm's hotkey and it'll be there for you, already set to the working directory of your current document.
Your selection (in the Finder) or your current document (everywhere else) is available at a keystroke for your command. svn adding, tarring, or scping specific files just got a whole lot more convenient.
For those cases where you need something more interactive than the command-by-command style of DTerm (say, for an emacs session editing a commit message), DTerm still serves as a great launch point. For any command, hitting Command-Return instead of just Return opens a new Terminal.app window set to the right working directory, and executes the command there for you instead. Executing even a blank command this way is a super-handy way to get a full Terminal.app window preset to the right working directory of whatever you're working on.
(Wait, or is that "proof?" Either way, we like pudding.)
One keystroke puts a copy of your last command's results on the clipboard and dismisses DTerm. This reduces the common open window-cd-command-select-copy-close window sequence to as few as three total keystrokes, for those keeping score at home.
DTerm also keeps a (configurably sized) history of recent results for your perusal and reference. More lengthy processes can also be easily managed through DTerm—it'll keep them going while you're away, let you check on their progress whenever you like, and clean them up after they're done.
DTerm fully supports a standard command line autocompletion system. If you hit tab or F5 in the command field, an autocompletion window appears with recommendations, and continuing to hit tab will even partially autocomplete just as you would expect.
Updates no longer exist.