* Improvements to US military technology (Israel tweaks stuff and then we use their tweaks)
* Anti-terrorism training and expertise (we started caring a lot more in 2001; they've been dealing with it longer than that)
* A liberal democracy in a part of the world without any others (whether or not you value this is up to you, but many Americans do)
* Intelligence
* A lot of American tech companies have offices in Israel, which means we have an interest in its stability and prosperity