Are you wading into the brave new world of responsive design - building websites that adapt intelligently to various devices? The folks at Opera created a tool (the Opera Mobile Emulator) that lets you emulate a variety of devices right on the desktop. There's no need to have access to a pile of physical objects to do thorough testing.
Here's a Smashing Magazine article written by the project developer at Opera: [mobile.smashingmagazine.com
...and here's the download link for the free tool: [opera.com