No, I don't have much of a centralised portfolio as we're working on some fairly large projects. But I can do this kind of thing easily. I can show JavaScript work, such as
http://slayz.mine.nu/Chemicular/ that I'm working on at the moment.
(Please note this is a home server and so if it's down then the server's switched off, and if it's slow, I'm downloading something I shouldn't be.)