Here's a good example on how to keep customers in the buying and loyalty loop.

Yesterday I browsed Oki-ni.com for some threads. I added a few items to my basket but left before ordering. The reasons can be many, but anywho I left.
This morning I received a mail from Oki-ni (see picture) about the items I added to my basket. I know it's a fully automated mail asking about the possible reasons for leaving. However I got the sense that they really cared about me. What if a technical error was the reason I left, they now offer me assistance.
Being the clever guys at Oki-Ni they did not forget to mention the sale that's going on at the moment - just another argument for me to buy the stuff in my basket...
Result: I'll head back to Oki-Ni, view my basket, consider buying again, browse the site and all the while feeling they really care about me and the buying experience I'm having.
Go yourself:
Oki-Ni