Basically on your sales page if you have a exclamation point after a headline - !
and its stands out, make that exclamation point, into a graphic.
Then post it, on your page, so it still looks like part of the text, but its actually a graphic/jpeg.
Then, next make this " ! " graphic a html link, to where if people click the exclamation point graphic, it will send them off to get a 25% or 50% discount.
Hide it well, so people do not really see it, and its your LITTLE SECRET.
Then email your list, and tell them about this little secret. :-)
1) It works well.
2) People love to find little secrets in your sales page like this. "easter eggs I call them"
3) People who are on the fence about buying your stuff, will buy if they get a nice discount.
I have seen some bigger markters do this too, and make nice sales over a weekend, with hardly any work!!!
Try it and see if you get some good results. :-)