started using flickr, whcih I think is great. Here you can store your photos, link the flickr page to my weblog, or post individual photos from flickr in my weblog. I can also tag the various photos, which means I asign them one or more keywords under which I will find the photos again.
It is also great that I can make add notes on my photos and write something into the photos (Good for beginners --> vocabulary learning like a picture dictionary, or creative writing --> T provides some pictures, SS write picture stories).

Tagging
With the technorati generator I can tag my weblog posts --> I asign certain keywords to my weblog posts and in this way organize and group them. I can also find other other weblog posts which have the same topic

I can also tag links I want to find again easily with del.icio.us
This is done by copying the link and then click "post to del.icio.us.