I still believe there is a difference between an index by keywords, and a powerful search engine: in the first case you have a human that uniforms the keywords, in the latter you have all the people using their phrasing and terminology (e.g. see my bad quality title to this node).
Mine was not a criticism at all, just a consideration of someone learning perl. And when I study I find an index very useful.
Anyway - according to what I've seen - I think this is by far the best website on perl around: I really commend the authors for their effort, and I'll sure browse around to learn; even without the keywords... ;)
ciao
Roberto