I agree, but not everyone can sell a company to Yahoo! They probably didn't care about re-writing the app in PHP. They did it for del.icio.us too. What about se

I agree, but not everyone can sell a company to Yahoo! They probably didn't care about re-writing the app in PHP. They did it for del.icio.us too. What about selling to companies which that not so technically competent but would still like to buy your product? It's so much easier to hire Java/PHP/Ruby/Python people compared to Clojure,Erlang,Haskell people.