I like Kent, keep a master list of my Iris in MS Excel. My list is in acquisition order, but it can be sorted by other means. My list was created when I had only 30 cultivars, all of which were unknown "Historics". So I have columns for Stands, Falls, Beard, & Haft marks. All four of these are no longer used. Then I have Hybridizer (with date) and then type(TB, BB, ect.). I should probably break out the date so I could sort by that, but as of yet there has been no need. The next column is quantity received. Then I have the season columns; my current document starts in 2009. I currently have three years of data in the spreadsheet with 2012 to be added. Then I have a "misc." column for things like "DM" (Dykes Medal Winner), PBF (Purple Base Foliage), or "RE" (Rebloomer). Lastly I have a notes column that contains where I got the rhizomes from. Overall, this gives a nice year by year look at my collection. I need to fix the issues with the spreadsheet, but it has been pretty good at keeping track. I currently do not have a "location" element in the spreadsheet. I do keep a bloom chart notebook for each year which does have the location in the yard. That could be a "Winter" project.