Well, stop by IRC and we can sit down and help you!
Prefixing all callbacks with "love." should be the first step - this will enable LÖVE to at least run your main loop, at which point it can start spewing errors at you.
If you're trying to draw text to the screen, replace love.graphics.draw with love.graphics.print.
love.default_font is now love._vera_ttf, but it doesn't matter because if you don't pass a Font to love.graphics.setFont, it assumes you want the default font.
Constants are now strings, but it should be fairly easy to port those - most of them are just simple replacements, e.g. "modulate" instead of love.color_modulate. The only exceptions to this rule I can think of are input constants - love.mouse_left is now "l", for example (see
MouseConstant). Keys are mostly just the character they represent, with some exceptions (see
KeyConstant).
Animations are out. Use Quads instead to draw sections of an image, or, if you want to minimize effort, use
bartbes' AnAL lib.
Images now, by default, have their origin at the top-left instead of in the center. Further, Image:setCenter() has been removed; there are two new parameters in love.graphics.draw (ox, oy) to determine the offset from the origin.
Those are off the top of my head, I can't possibly come up with all the changes on short notice like that. Seriously, though, drop by IRC. It's snowing hard outside and I'm not going anywhere for a while.