Flickr, Webshots, Photobucket and Picasa. I use them all. When online photo storage first started, there were very limited options and some had one feature I liked and another had another feature I liked. Now, I could just use one, with different folders and privacy settings.
I would put the time in and get all my online photos at one site, perhaps Flickr and even pay for it, but the work that is required is unimaginable as links where I have posted my photos on the net would all get broken and I would have to repair them, although some photo posters don't seem to care about that.
I like my photos but I don't think I am a very good snapper. Even my dirty camera lens had to pointed out to me. Thanks Reuben.
Speaking of good photos, and I thank Jayne for alerting me to this site, have you ever taken a look at Shorpy's Photos? It is site of mostly historic black and white photos from the US. The quality of the some of the photos are extraordinary and yet they can date back to the early twentieth century. There are often railway and tram photos posted. Make sure you see the high resolution full sized photos.