I use flickr to host pretty much all of my recent photos*. It’s decently priced, feature-rich, and has a great community, with people from all over the place interacting, encouraging, and helping each other out. Ottawa’s got a smallish but active core of users, and we’re having our first meet-up at the end of this month. I’m a big fan of everything about it.
That said, it took me a looooooong time to figure out how a number of features worked (my favorite poorly-known feature is the guest pass, which allows you to share protected pictures with friends and family without needing a uname/password). There’s a lot you can do, and it’s not always intuitive. Thankfully, there’s a good read that’ll help you get started.
Someone took the time to write a Newbie’s Guide to flickr, and it is highly recommended for people getting started out with the service. The only thing the article doesn’t mention (and probably should) is that the FAQ is a great source of information (this means “read it”), and that with a little search-fu the forums and the people posting in them are crazy-helpful. It’s a great place to start before you even upload a pic. Check it out.
* – I still have a tonne over on gallery, but the lack of effective spam controls, huge influx of comment spam lately, and impending server upgrade means it’s not long for this world.