Rxvt-unicode (aka urxvt) has been my terminal of choice in Linux these days. Since I like to use the keyboard as much as possible, I found it frustrating that I couldn’t paste from my clipboard into urxvt without having to use the middle mouse button.
I searched for a solution to this problem, and found urxvt-perls by Bert Muennich. His clipboard plugin for urxvt adds CTRL-v pasting to urxvt. It solved the problem perfectly.
Another great tool along these lines, is parcellite. It unifies your primary clipboard (those things you highlight with the mouse) with the copy clipboard (things you specifically use CTRL-c or Edit > Copy for). With parcellite running, you can click the “Copy URL to Clipboard” icon on Github, then ALT+Tab to your terminal, and type: git clone <CTRL-v> to clone.