Hi,

i'm not sure that it's bug.

If uncaught exception is occured then IEDriverServer.exe and iexplore.exe can not closed
w/o any actions.

This code will work well, i think:
--------------------------------
java.lang.System.setProperty("webdriver.ie.driver", "bin\\IEDriverServer.exe")

var driverClass     = Packages.org.openqa.selenium.ie.InternetExplorerDriver
var driver          = new driverClass()

try {
    driver.get('http://google.com')
    throw "yo"
} catch (e) {
    //
} finally {
    driver.quit()
}
--------------------------------


I has no experience with Rhino so i can be mistaken.

If I'm not mistaken one can use "shutDownHook" for cleanup, which will be called when
process exit, regardless is it because of exception or not:

(Again, Rhino script, I was using it in some other program):

java.lang.Runtime.getRuntime().addShutdownHook(java.lang.Thread(function () {
}))

Selenium provides an API to drive the IE browser using a driver executable. This API
includes 'quit' operation that stops the browser and the driver and performs cleanup.

Selenium is an API rather than a test execution framework, hence it just provides an
operation to stop the browser and the driver. To call it or not to call -- it's your
choice. If you don't call this operation, Selenium doesn't perform cleanup. You may
use whatever you want: a shutdown hook, a 'tear down' method of your framework, a try-catch
block, anything else.

If you want to negotiate this design desision welcome to IRC channel [1] or dev list
[2]!

[1] #selenium at Freenode (irc.freenode.net)
[2] https://groups.google.com/forum/?fromgroups#!forum/selenium-developers