What would you expect from a site that does the EC -> English mapping?

I've been mulling over making one for the longest time, and though I'm not going to promise anything... I'm going to start fleshing it out.

I never fully got my head around it though, so it's up to you guys to let me know how you think it should work.

What would the users enter? What would be presented? You can have multiple EC symbols for a single word, can't you?

Any resources you guys have saved links for would be appreciated too to save me having to crawl through all the threads - as I've got the way back machine, but some of the image links are broken and I'm pretty sure things have been documented else where.

If you give me some ideas, I may start putting things in motion :)