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An eccentric Jupiter is a Jovian planet that orbits its star in an eccentric orbit. Eccentric Jupiters may probably disqualify a planetary system from having Earth-like planets in it because a massive gas giant with an eccentric orbit may remove all Earth mass planets from the habitable zone.
To date, it appears that approximately 7% of all stars (half of the known planetary systems) have an eccentric Jupiter (e > 0.1), making these planets more common than Hot Jupiters.
Out of the more than 200 extrasolar planet discoveries (as of 2006), 15 planets have high eccentricities (e > 0.6).
The typical exoplanet with an orbital period greater than 5 days has a median eccentricity of 0.23.
Possible habitable zone planets near eccentric Jupiters:
References
Eccentric Jupiter Wikipedia(Text) CC BY-SA