I've tried many mice for my notebook, and the best most comfortable tiny mouse, for travel or stationary use, is the Microsoft Wireless Notebook Optical Mouse. It's as fast as a wired mouse; there's no lag. Maybe you don't want a mouse that requires a battery since it could leave you stranded, but the battery lasts a few months (I use mine daily), the USB adapter snaps into the bottom turning off the power when traveling to save battery life. It's snappy, very responsive, accurate.