questions on features of PHpStorm

1) I noticed this page has instructions on installing debugger for various browsers:
http://confluence.jetbrains.net/display/WI/Browser+Debugging+Extensions

But I also notice that there seems to be no xdebugger for Internet Explorer. Is there an xdebugger for IE too? If not, then is it possible to have use both xdebugger and zend debugger so that I will be able to debug in any browser?

Debugging is browser independent. You can use any of the engines.

2) Does the PhpStorm have a word wrapper?

Yes

3 i) There is some javascript debugger with the WebStorm. So does this javascript debugger work in conjunction with PhpStorm to debug, say, AJAX calls with jQuery or some other JS framework?

You can use Php debugger for server side and js debugger for client side simultaneously.

3 ii) In a related question, will this IDE be able to debug with firebug and perhaps IE's internal debugger as an option?

Our JS debuuger is build for Firefox.

4) I've been using Nusphere's IDE which is great but unfortunately it only works with Windows. I would really like a cross platform IDE. I've was using eclipse but I really don't like their debugger setup where it seems like one has to create a separate entry for each page one wishes to debug. That's a bit of a hassle I think. With Nusphere's debugger I simply press F4 and the debugger starts to work. I hope Jetbrains is as simple.