Is there a way to share iPad's (second generation) Internet with MacBook? (tethering)
There is an HTML5 app which will allow you to turn your iPhone into a personal hotspot without any jailbreak or extra apps. I don't know if it will work on iPad though...

And a second solution is not what you want to hear. The most easy solution is to jailbreak it indeed. There is an app in the Cydia store called TetherMe ($1.99). And it will allow yout to turn your iPad in a personal hotspot within the minute. It's super easy to install and very useful when you're in a desperate need of a 3G connection.  

And these days, jailbreaking is as easy as it was before, so I'm not sure why people are against it since you won't lose your warranty or anything alike...