Rooms 6016-6030 and 6021-6035 have larger balconies than the standard one. I select them for all of my cruises. The ship layout doesn't show them as larger but they are. Twice the size (in depth) actually and if you have mulitple parties going with you, they are a great place to gather and watch the world go by.
On 2 occasions, after selecting one or more of the above rooms, Celebrity bumped me up to a Concierge Class on deck 9. I preferred my old room frankly. Nothing to write home about for Concierge Class. And just recently for my May 29, 2009 Alaska cruise, I was bumped up to a Sky Suite on deck 6. Larger room, came with a butler that delivered cookies and tea automatically in the afternoon, and then some h'orderves just before dinner. Again, nothing to write home about. I do love the balconies because it's nice to have a place to hang out that isn't crowded on an "at sea" day.
Also if you are doing Alaska on the Infinity in 2010, be sure and go to the Brent Nixon talks during the cruise. He did 5 talks about whales, bald eagles, orcas, bears, sea otters and seal lions. His website is:
http://www.naturetalksbybrentnixon.com. He is spending both this summer and next summer on the Infinity doing his "nature talks".
We did the Bering Sea "Deadlist Catch" tour out of Ketchikan and it was worth it. We did 2 whale watching excursions out of Juneau and Victoria and both were a bust. Felt like I threw my money overboard.
Enjoy your trip. You won't be disappointed.