what I have I generally remember, but speakin of 1000's of books, if you know what you like IMO more is always better for the right price....etc
If i speculate on some comics then it is hard to remember and I write it down, or if there is a particular issue say of Adam Hughes or any other artist that I am trying to familiarize myself with I write it down as well
As far as a wishlist, I pretty much remember by the cover or knowledge of first appearances from the boards, ebay sells, or other factors.
I can understand if the LCS thinks it is rude to check ebay on my phone to compare prices, so I try to do that at home, otherwise haggling at the LCS, flea market etc can be a pain