It would be rad if the website has the ability for a wish or shopping list that I could save pcb's to when I'm browsing the site.
I keep a simple text document of stuff I like and a "Short-List" at the top of the doc.
When I purchase something, it goes from black text to pink; when I receive it, I change the text colour to green.
The colour-coding helps me keep track of what's what and prevents unwanted repeat purchases of the same circuit.
As stuff gets greenlit, it goes back into the main list, so the Short-list is constantly evolving.
I'd probably use a Wish-list feature on the site, but I wouldn't give up my simple-text doc system.