Konsole, because it supports tabs, allows you to control multiple sessions from one (broadcast commands to all other tabs simultaneously), supports profiles and bookmakrs so I can open the same set of tabs everytime, but with different sets depending on which servers I want to connect to, integrates with KDE, can be set to have an unlimited scrollback buffer, and all around just works. And now, with the KDE4 version, supports splitting a single tab view to show multiple terms at once.
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