If you are using GV with your Friends & Family account for free outgoing calls, don't upgrade to the version that's in the market now. It will assign an individual new number to each of your contacts, so you won't be able to do the free calling trick.
Edit: Added version 0.3.2 in case you already updated on accident.
Edit 2: looks like Sed has 0.3.4 in post #8 below.
Edit: Added version 0.3.2 in case you already updated on accident.
Edit 2: looks like Sed has 0.3.4 in post #8 below.