It works quite well! I tried a few keywords (tuple, range, front, frot, cons...) and it gave good results. Heck, I even discovered functions I didn't know existed and had written by myself :-)
 
What kind of help would you need? It's already quite efficient and would complement quite well the search already present on the Phobos pages.

Trick question: what about the changes in Phobos coming with each new DMD version? There are indicated in the version notes and'd be easy to add in your list, but can you be sure they are the only ones?

Philippe