Edit: Unfortunately, the images originally included in this post are gone, because of hosting problems in late 2009. My apologies.
I didn’t think such an animal existed, but here it is — Sakura.
Follows your GTK theme, has a nice right-click menu and copies and pastes like a text editor. Pseudotransparency, customizable backgrounds and excellent font effects. It’s just about perfect. 😉 This might be the end of rxvt-unicode for me.
That’s the Arch version, by the way. Ubuntu users will need to compile from scratch. 😈
Pretty easy to compile in Ubuntu (Gutsy, at least): just get libgtk2.0-dev (if you don’t have it already) and libvte-dev, and you’re a “./0”, a “make” and a “sudo checkinstall -D” (to get that .deb file as well) away from a really cool term.
Doesn’t replace urxvt for me, though! I have tabbed urxvt’s by default (Fluxbox rules hehe – I know you’re more of an Openbox guy), pseudo-transparency and acceptable fonts with it, anyway. It’s lighter and also seems faster, so urxvt is still the champ!
There is also Terminal, which is shipped with Xfce but doesn’t require it. It integrates with Gtk+ very nicely including, menubar, toolbars, tabs and context menu. True transparency is available as well.
http://www.os-cillation.com/index.php?id=42&L=5
I used to run Terminal a lot, but I kind of abandoned it when I moved to Openbox. And since I mentally associate it with Xubuntu, I have a tendency to skip things that are XFCE-based.
Looks like there are quite a few more dependencies for xfce4-terminal than Sakura, though.