Looks like Picasa 3 for Windows seems to be the appropriate tool
for
doing that. Free and easy to use — these reasons are good enough for
me.
Update / 2010-06-22:
Alright, alright, I can simply use iPhoto on OS X for that. Silly me!
Did quite a few snapshots, uploaded them to the relevant places …
Life seems to be far easier with the right tools, i.e. on a Mac, esp. if it’s running a Unix derivate …