.Products

The URL you've pasted is not formatted correctly. You cannot copy & paste the text from the page because some browsers change &sect to the "section character" used in legal documents.

Replace the section character in your URL with &sect...

http://open-api.cafepress.com/product.listByStoreSection.cp?v=3&appKey=hvethzdaejxrumeh3xaps6ub&page=0&pageSize=10&storeId=jesuschrististheman&sectionId=0

We'll make that URL display a hyperlink in the next release so you can just click it from the page itself as a sanity check.

So the new URL provided lists:

FrontCenter FrontCenter FrontCenter FrontCenter FrontCenter FrontCenter FrontCenter FrontPocket BackShoulder BackCenter FrontCenter FrontPocket BackCenter BackShoulder FrontPocket FrontCenter BackCenter BackShoulder FrontCenter

Am I doing something obviously wrong with this install?

Thanks!

That means you are getting product back (the browser is parsing XML not HTML at this point so the display will come out like that).

Are you not seeing products appear on your site?

Yeah. I was hoping someone could point out something simple that I may have overlooked.

http://www.jesuschrististheman.com/about/

If you are using a premium store you need to specify section IDs:

If you have setup store sections & have NOT setup any default products then you must provide a section id.

Learn more here:
http://redmine.cybersprocket.com/projects/wpcafepress/wiki/Using_MoneyPress_CafePress_Edition#section_id