It should also be noted that they've sort of semi-recently discovered how to sign homebrew applications, meaning you don't actually "need" custom firmware if all you're trying to do is run homebrew (including emulators). Here's a link to a list of signed emulators in case anyone is interested; http://wololo.net/talk/viewtopic.php?f=47&t=8386

Also if anyone does happen to use this list and finds broken links on the more popular consoles let me know so I can find a different list to start posting/create my own if necessary.