An Irish passport actually isn't good EVERYWHERE. I've been living in Colombia for a couple of years, where they require visas for Irish citizens, but not for almost anybody else.

Turns out that a few years back the Colombian government found out that the IRA had sold at least a few guns and bombs to the FARC (the marxist guerilla force that has been terrorizing Colombia for about 40 years), and threw in some military training as well. The visa isn't difficult to obtain, but you can't just show up at the border and cruise right in. They might spend a little time search the bike (and hard to reach body crevices) for some pocket-rocket-launchers.

I'm a dual citizen with the USA and New Zealand....and yes, I usually use my NZ passport, depending on how much time they'll give each citizenship in which ever country I'm entering. But the US one actually isn't that bad, at least not regarding hassle etc crossing borders. In some countries you might not want to tell some people that you're from the US, especially if they're toting a large fire-arm and wearing an anti Bush T-shirt, but in general I haven't had any problems.

I'll still stick to the NZ one however, just to make things a little easier should I happen to run into that marxist guerilla when I'm hitting up dirt tracks in the Colombian jungle.

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www.motoadventures.org Photo Journal of My Alaska to Argentina trip.
www.casakiwi.net My Moto Hostel in Medellin, Colombia...with a garage of course.