I always hated my high school and college Spanish assignments for one simple reason: I can never remember which keys I've assigned special characters to. I think I've probably googled "ñ" and "í" 300 times each. If you're as absented minded as I am and you find yourself typing in languages other than English - or even in need of simple HTML combo help, you should download the CharacterPal widget for Mac.
The widget that helps you remember how to type any special character, for keyboard or HTML combos. You just place your mouse over a character, and the key combo appears at the bottom. Now you don’t have to remember what Option + Shift + K does, you can just look at your character chart. Writing an ode to piñatas? It's got the ñ's covered too.
Not a Mac user, read more
PC users can check out the Character Map utility, which gives you special characters which you can use any program. From the Start menu, select Programs, Accessories, System Tools, then Character Map. Use the drop-down menu to browse the fonts. Then, when you find a character you want to copy, click it, click the Select button, then Copy. Click Close, return to the program you were working in previously, and press Ctrl+V to paste the character into your work.