Version (0.2) of my Firefox extension to make LSIDs "clickable" is available from http://darwin.zoology.gla.ac.uk/~rpage/lsid/.
This version uses a server in Glasgow to resolve the LSID, rather than bounce you to the Biopathways site. Basically this makes browsing LSID metadata much smoother -- if the metadata refers to other LSIDs, you can simply click on those as if they were URLs.
This is still all a bit crude, but here are some example LSIDs to try:
