i think this is a good idea. i've been trying to follow the examples put forth by the default art, or if it's really long, shortening it to something still recognizable. (you know- icon_* for icons, back_* for backgrounds, etc.)
i think that standardized labeling is best forward as a guideline, and not as a rule. i.e. we should encourage it, but not castigate someone for not following it. in other words, if i've done a whole bunch of work, i don't want to go back and change the name. (because i am lazy
)