If I root my Android phone, will I lose all of my data?

As the question title implies, if I root my Droid Incredible (or any Android phone), will I lose all of my data? I'm not interested in installing a custom ROM right now so will rooting cause me to lose my data? Also, which tool should I use to root the phone? **Edit #1:** Based on a suggestion, I rooted my Incredible using Unrevoked, and I didn't lose any information.