While I don't love QB Online, it does work on an iPad

www.sleeter.com/blog/2011/05/manage-payroll-from-your-iphone-or-ipad-with-intuit-online-payroll-mobile/

Just offset 20.5 tonnes of CO2 for another carbon-neutral year. Make your site or biz carbonfree : www.carbonfund.org/carbonfreewebsite

Intuit Complete Payroll to be discontinued as of 12/31/11. Don't just go with another Intuit service, unless it truly suits your needs.

Intuit GoPayment credit card swiper compatible with iPad. Very cool.
http://gopayment.com/