nice find! from just glancing at the source, it looks pretty simple. and the ui is very nice. it will be interesting to see how all these ajax frameworks that are floating around (scriptaculous, yahoo, atlas, et. al.) will mature as the competition heats up.
what i've found is these frameworks that provide the fancy photo albums, drag-and-drop interfaces, and other cool widgets don't really differentiate themselves when it comes down to what the user sees. what if you need a specific feature? do these frameworks really help reduce coding efforts? what if i have some complex data coming from the server and i need to post that? do they help? i'm asking these questions rhetorically, and i admit that i haven't used any of them.
atlas looks to offer the most scalability for customized applications, but again, i haven't used it yet.
i've used the xmlhttprequest send/receive code from the article on apple.com (
http://developer.apple.com/internet/webcontent/xmlhttpreq.html) and another lightweight framework called ajform in several web apps. they work great when you need to include a feature outside the realm of recreating flckr, but they require a lot of DOM work (which can be a little bit tricky at times).
all these "fancy" frameworks are nice, and it's good to see competition, but how many hammers does one need?
