>1) FrontPage Express doesn't seem to be included any more. Can it still be obtained as a separate product?

Got to http://windowsupdate.microsoft.com/?IE to install it.

>2) According to the help, I can type "? MySearchWords" in the URL-area, to do a search. Can I configure IE6 to use my favorite search engine (e.g., google), or can I only use this option with MSN?

Yup. See http://www.ieinfosite.co.uk/tip_view.asp?id=182

>3) What is Ctrl-Click, on a hyperlink, supposed to do? When I tried it, IE6 worked for quite a while, but nothing seemed to really happen.

For me it is identical to a normal click. Works instantly.