I have often found what I think would be a great subject or location, but other variables are just not right at that moment (It rarely keeps me from shooting though). This may be related to my personal likes. I'm not too interested in shooting monuments or famous tourist locations, more the "off the beaten path" type things or scenery. I also have a, perhaps perverted, interest in old buildings, abandoned homesteads, etc. I also prefer shots during the first of last 60-90 min. of daylight, not exclusively, just a preference. Frequently I happen upon a subject and it has potential, but it is the wrong time of day, wrong season, wrong weather, etc. I would, in the past, just make a note, sometimes mental, to get back there. Most of the time I forget particularly if there is a great deal of time or distance involved in getting back to the area. I started taking and saving these did bits of info. in a spreadsheet to include location (I now use GPS coordinates by simply asking my Garman, where am I?). I also include preferred season, time of day, weather conditions, etc. If we are planning a vacation, such as our annual trip to Michigan's UP, I can resurrect my thoughts from previous trips or if the subject matter is more than an hour's drive. Does anyone else keep track of "potential" future shots for the same reasons, though perhaps not quite as anally?