Is there an app for viewing acad or solid works drawings?

Really not any, at least worth having.... The iPad is brand new, give developers some time...

The app below might work for you, but I know I would not buy it at this point in development.....

CARTOMAP CAD for iPhone, iPod touch, and iPad on the iTunes App Store

How to publish your Solidworks files to view on iPad

Autodesk inventor Publisher will allow you to import Solidworks files directly and then publish to your mobile device.
Publish Your CAD Model to iPad or Android Device - Some Assembly Required - Some Assembly Required Channel :: ENGINEERING.com