A quick look at the way various international auction houses promote their catalogues online. Check out GOFFS as a starter (http://www.goffs.com ).

Goffs' pedigree are in standard format. You'll note that you can click on the pdf version of the pedigree by clicking on the lot number. What really intrigued me with these catalogues were the photos as a number of them are not 'standard' side-on confomation shots many other auction houses adopt.

Here's another example from Europe - Tattersalls (http://www.tattersalls.com). Lot numbers are also hyper text linked to the full pedigree but when you open the pedigrees they are (heaven sent!!) in Adobe Acrobat format and you can edit/cut/paste/zoom in/print - fantastic if you are doing catalogue research for a client and want to include notes for your own purposes (as an aside - remain aware of relevant copyright laws if you are passing on these printed pages to clients).