<p>Can iPhone applications compiled against 2.1 be successfully installed via iTunes on a 2.0 device?</p>

<p>I know iPhone applications compiled with 2.1 can <em>run</em> on a 2.0 device (assuming they're not using anything new from 2.1). But am not sure if iTunes will let the install take place.</p>

<p>Does anyone have concrete information on this?</p>

<p>I have not seen any apps on the AppStore that are 2.1+ only.</p>

Short answer, yes.
There have been some apps that dont work 100% in 2.1, but the two firmwares are pretty much backwards compatible