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I know a lot of you guys store ammo in ammo cans, many of you may label them with a labelmaker, sharpie or crayon. If you are anal like me you might want to check out this link. I have nothing to do with the company, my brother found the link and sent it to me. I ordered several labels, i am actually cleaning up all my cans right now getting ready to re-label them with these.
http://www.weaponstickers.com/labels/" onclick="window.open(this.href);return false;

Those do look decent.

I use the blue painters tape and write on it with a black marker. The wide tape is big enough to add more details such as bullet type, sometimes adding an outline for defensive rnds vs target rnds. It sticks good and comes off easy. And I change the tape or add another piece of tape as needed. Sometimes on more than one side for viewing at different angles.

I do the same to the sides of my rifle mags too.

I hear ya, I go thru plenty of blue painters tape-I label most of my reloading stuff with it. Like you said lots of room to write and easy to remove and replace.
Just thought the stickers were kinda neat.

You can buy those, or....
Get a Brother P-touch, Dymo, or Epson label maker. They are inexpensive to purchase, but materials can get $$ if you don't hide the label maker from the wife and kids. Any load info you want: dates, weights, bullets, primers, brass, powder, not just caliber.
I use a Dymo:
http://www.dymo.com/en-US
I reload and staying organized is important, the laminated labels are just about impervious to environmental attack.
P.S.
Hide your labeler, young ladies will label everything in the house if you are not careful.

Another good option I've found similar to those; only difference is they're magnets, thus you can relabel easily. He makes them with space to write on them too.

http://shop.ammocanmagnets.com/

Ooooh! I likes those even better.