I use a FilemakerPro database with the following fields:

HL Number
Lighthouse Name
State
Edition Size
Price
LE #
Have (Y or N) [I track all LEs wether I own them or not]
Signed (No, Bill, Nancy, Kim) [Check boxes]
Where purchased

I stopped added GLOWs since I don't buy them. I do add LLOM but only the ones I have. The Signed field is very useful when a signing event is nearby.

Robert