Do you know of any network-aware cut'n paste (clipboard) tool between Windows (XP min) and Linux (Ubuntu) - Need to free scarce brainpower resource consumed by retyping dodging strategies.
This is an odd case used by a friend, but just in case it fits your scenario. He has different computers in physical proximity connected by network and wanted to share the keyboard and mouse. He decided to try Synergy http://synergy-foss.org/ It was serendipity that it also allows for copy and paste between computers. Again a very specific case where the boxes, and screens are near each other and the goal was to cut it to one keyboard.
If it's just remote access, I just copied something in an UltraVNC viewer on Windows, and pasted it locally, and did the same from Ubuntu using remote desktop viewer.