I'll chime in with a few tips for climbing: As you grow stronger as a rider and get more comfortable on the bike it's good to mix up your position while climbing (sitting, standing, as well as your hand position). Some riders (expecially on longer, more gradual climbs) like to "sit up" and put their hands on the tops of the bars to ensure maximum lung capacity. Breathing through your nose is important and being relaxed (through your shoulders and upper body, etc.) is key to being a good climber. Another important note is to climb at your own pace; Don't get worried if those you are riding with pass you on a climb. In the low key rides I do, we always slow up at the top of a climb when needed to regroup. While you may not like hills, they're hard to avoid, and you must practice them to become a better climber!

Here's a short article w/ pictures to show a few of the different hand positions.