This is in radar as 10034302.
1. In Snow Leopard, load a PDF page in Safari.
2. Control-click or right-click on a blank area of the page (not on text) to bring up a context menu.
The context menu does not include an “Open With” item. (If in step 2 you click on text instead of background, the “Open With” item is present.)
Created attachment 112358 [details]
Patch to insert the Open With item at the top of the menu if no Copy item is present.
Fixed in 98362.