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Apropos of nothing, <a href="http://www.ctc.org.uk/desktopdefault.aspx?tabid=3946">here's a nice article</a> from the CTC on mixing and matching shifters and derailleurs from different manufacturers. The hubbub method of running the shift cable to the derailleur mounting point is <a href="http://www.hubbub.com/articles_ergopower.html">presented here</a> for your education and elucidation.

I'm running Campagnolo Ergo 10 shifters on the front, and a Shimano Sora derailleur on the rear and it shifts very nicely.

Of course, you can always throw money at the problem with the <a href="http://www.jtekengineering.com/shiftmate.htm">JTek Shiftmate</a>.

I "threw money at the problem" with the shiftmate when I bought a campy drivetrain and then couldn't afford a campy wheelset. It cost me less than $40 parts & labor at ABR, which for the most part was worth the hassle. I've never had to work on it and my derailleur works great. Don't be afraid to put a nice shimano one that costs half of campy, unless you're an equipment snob (which I understand)