And the Winner is...
Well, as I hinted above, it depends on what you most want from an online photo sharing site. For sharing and storage, it is hard to beat the value of Google's $5 per year for 20Gb of online space with Picasa Web Albums. However, Flickr's 100Mb per month, (1.2Gb per year), is likely to be enough for many people, and you get that for free, along with all the other advantages of being on Flickr.
If a portfolio style is more to your liking, and you want some control over privacy and access to your images, then you will likely be flipping a coin between Zenfolio and SmugMug. Personally, I use Zenfolio as I think it offers the best balance of style and price for the features on offer, but I would encourage you to try a free trial for each to see which one best appeals to you, and then look for some referral codes on Google to further reduce the subscription costs of each, (9AR-SYE-HBY, for instance, will save you $5 on Zenfolio plans).
Finally, if your second home is forums and chat rooms, and you communicate more through social network sites than you do by email, then Photobucket's integration with the best social networking sites and blogs means that you are only a few clicks away from a seamless photo sharing experience with all your favorite websites.