wp2 thumbnails in posts

heya,

i just started playing a bit with wp2.05 and immediately liked the option to automatically create thumbnails of uploaded pictures and add them to the posts.
now my question: this “feature” is really only for creating thumbnails. but i’d like to have the thumbnail linked to the fullsize image, else the thumbnail is more or less useless. is there a plugin or hack i could use to accomplish this?

regards
chris