Well, this is certainly better than the solution that I came up with. Mine requires Exposé and therefore Panther or better. It works but it's more labor intensive. I used the Exposé F10 (show all windows of current application) feature, which brings all of the stickies onscreen. Then select the one I want and, even though it goes offscreen, I know it's selected. Then I use command-A (select all) and command-C (copy), then command-W (close). Then I make a new sticky and paste the contents into it.

Lather, rinse, repeat -- until all the off-screen stickies have been replaced.

Before anybody *censored*es about this, by the way, I already conceded that this hint is way better than my old resolution (pun fully intended). But I'm still impressed at my ingenuity and resourcefulness :)

I just experienced the problem of dissappearing stickies as a result of connecting an external dsiplay. I am running 10.3.9 In the case of one of the stickies it went under the menu bar with enough sticking out that I could see it was there, but couldn't drag it out. The others had hidden under the dock and were easy to get at. I tried most of the things, before reading this Fix, that responders proposed without success. loumat's fix did work! Thank you.