You should probably stop shedding karma for today - your unsubstantiated, inflammatory Apple-hate has already gotten you modded into oblivion today.
But I'll bite:
- MagSafe. You cannot buy this feature anywhere, and it has saved my laptop on numerous occasions. In fact, in university I knew a guy who fixed out-of-warranty laptops for other students, and "power socket ripped off motherboard" was the most common repair he did. The fact that it snaps into place from a distance also adds that little bit of extra ease (as opposed to hunting for the hole).
- Better monitors. Seriously, do you think a $500 HP laptop can stand up to the monitor on a 15" MacBook Pro? Apple isn't the only ones offering 8-bit panels on a LED backlit screen, but if you look at any other laptops offering this you'll realize they're also in the MBP's price range. You do get what you pay for.
- Form factor and size. Your $500 Dell Inspiron is 2-3 times thicker than my MBP, and weighs 50% more. Is the size and weight savings worth it for you? I don't know, that's for you to decide, but there is a difference.
- Metal vs. plastic construction. The best keyboard I've used on a PC laptop ever is the ThinkPad keyboard (I have one right now, in fact), and even that is no match to the stiffness offered by the new aluminum-framed MacBooks. Go down to a $500 laptop and what you get is mushy crap that will twist and bend as you type. Been there done that, sick of it.
- Touchpad. The multi-touch gestures are an incredible productivity booster - two finger scrolling is the way it is meant to be. Shoving your fingers into the corner of your touchpad just to scroll is counter-productive, annoying, and just plain backwards. Being able to access any open window from a single gesture swipe has also improved my productivity.
I could go on, but go ahead and keep trolling and insisting that the "looks" is all that is different.