I am looking at building a online product catalog with SharePoint 2010. I have poked around but I cannot seem to find any information, at least with SP2010. Any pointers on where to start?
The reason you couldn't find Product Catalog for SharePoint 2010 is because it has been introduced for SharePoint 2013 for first time, its not available in SharePoint 2010 so no wonder you couldn't find anything on Internet about it, however if you want to read about it for SharePoint 2013 then you should try this link.
Product Catalog — You can think of this as almost a published list or library. Unlike content from SP2010 which was usually entered into pages via page layouts, we are just talking about fields that get filled out — just data pretty much. Creating this first piece is going to be the subject of this post.
Hope it helps.
Please look at this question and my answer it contains everything that you would want for your catalog :) plus more!
hope it helps!