Spellcheck as you type is one of the greatest features of the modern PC. One of my favorite features of Mac OSX is that you have spell-check as you type in almost every application. (Well, not applications that don’t use the Cocoa graphical framework, which is one of the many reasons I use almost no non-Cocoa programs—Adobe apps withstanding.)
One feature I’ve wanted for a long time is a key combo to open up the spelling context menu. When I’m typing away and I notice a red squiggly appear under a word I typed three words ago it’s very jarring and inconvenient to then take my hands off the keyboard and mouse over to the offending word, right click and choose the correction. It’d be much easier if I could just press a key-combo of my choice and it would automatically pop open the menu for the last misspelled word I typed, and let me arrow down to the correct word, hit return, and then keep typing where I left off.
