I'm a Leo/Virgo Cusp & they refer to us as the "Cusp of Exposure". As the above poster said, there are Decans (& they elaborated very well what they do, lol) & they affect your personality (because either way you put it, the heavenly bodies above you were floating & transiting different times during the month).
Anyways, according to what I've read, many astrologers claim that Cuspies are lucky because we are able to draw energy from two-signs & use them at will (for instance, mine is Sun & Mercury, so, I can draw from both energies).
Sometimes you can look at your chart as a whole to figure-out where in your life you draw these energies in. For instance, the Leo part of me loves fashion & art, but the Virgo in me ("The Helper") is why I decided to be in the medical-profession & I LOVE to organize things! See what I mean?!
Despite that, it's really hard to pin-point on an astrology site where your traits come in on because you are an unique person. For instance, I look at my Birth Chart to see where my Virgo traits are likely to come in at &, like I mentioned above, my Sun & Mercury sit in my 10th house. See what I mean?! But my Uranus/Sun aspect shows why I'm flamboyant (at times) in dress. Your chart often reveals a lot about your Cuspie nature!
Decans help to understand and give a closer-view of what you need to focus on. These two following websites are 2 of my favorites to go to when I'm on a Cuspie whim:
http://www.alwaysastrology.com/sun-signs.html
http://www.solutionastrology.com/chooseothersign.asp?firstsign=21&firstname=Leo-Virgo Cusp
I've read that Cuspies should date other Cuspies because of the whole 2-sign dynamic deal, but, I've done both. LOL. I can't say I'm a testament to that claim!
& Depending if you're using the 12-signs or 13-signs, your Cusp can adjust or you're a completely different sign! But, I'm going to assume we're talking the 12-signed wheel that is common in the Western Zodiac!