The new update, referred to both as firmware version 1.1 and also "RC33" brings Voice Search, Google Latitude, and improvements to the update process in Android market (one of our G2/Android wishes has come true!), on top of bug fixes, etc. MobileCrunch has an easy guide to follow: don't forget to heed their warnings and back up any important files on your phone first.
Word to the wise though-you may want to hold off on this until tomorrow, because this Saturday's Giz how-to guide will give you all the new RC33 1.1 update PLUS several nicer surprises that are worth holding out for. So consider yourself warned, and come back tomorrow! [MobileCrunch]