I'm converting now, and I've got way too many stamps to stamp them all, scan them, then put them in Evernote. Someone here just introduced me to the Evernote clipper add-on. It can take a snapshot or screenshot of web image and save directly to Evernote.
I list my stamps by manufacturer, and then set name if applicable (For example: Raisin Boat: Get in Gear). I then tag away to make sure I can find that set (for example: gear, bicycle, steampunk).
Using the web clipper, I'm finding as many images of my stamps and sets as I possibly can on-line, then save that image to my notebook. Saves me so much time.
Here's a sample of one of my notes. It's for the Amuse Studio Contemporary Greetings set. My tags are along the top, and other notes in my stamp notebook are on the left site.
If I can't find a decent image on-line, I see if my storage system has an image of the set I can scan (such as the DvD cover, like with the set above). If that fails, I stamp the images and then scan them using my Fujitsu Scan Snap.
I also note how the set or stamp is stored. For me, that means wood (all wood stamps are in a cabinet by general theme), cling, cling sleeve (means in an Avery Elle Pocket instead of a DvD case), bare (all in Avery Elle pockets), or clear (also all in Avery Elle pockets). Since my storage, aside from wood, is by manufacturer, I can put my hands on any of my stamps in sections.