It's been years but...

Use an exploit to install freemcboot onto your memory card (or buy a memory card with freemcboot already on it), download your legitimately owned games as isos (perfectly legal if you own the game), prepare a USB drive with the isos, and use a usb loader app to play your games.

If you're really savvy you can even load the isos over network via SMB share.

Obviously this is broad strokes, and there's no way I'm posting links to things here. This is perfectly legal as long as you own physical copies of the games you download.

Can't wear out your discs and laser if you don't use them :)