Have a look at the DOJO toolkit for the fisheye widget. This is the cool icon expansion thing that Apple’s do. I like!!! Looks like you can create these expanding icons in your web page using javascript.

http://dojotoolkit.org/

Nested lists in Menu Navigation hot tip:

Use document.write() to write the styles that hide the nested ULs. That way without script support, these rules do not style the sub menus.

Some very interesting tutorials, designed in Visual Studio 2005:

The tutorials are as follows:

A.P.I. Method Documentation

MSHelp2 Conversion and Integration

Using Dynamic XSLT

Creating Accessible Tabular Data Tables

Creating Auto-line Numbered Code Blocks

Calling Accessible Context-Sensitive Help

Building Accessible Static Navigation

Here is the link: http://frank.helpware.net

Great tutorial on creating CSS drop down menus (I gave it a go and got it to work): http://www.projectseven.com/tutorials/navigation/auto_hide/index.htm

Also this little snippet will prevent the dropdown button from

overlapping the text in the options on the dropdowns:

option { padding-right: 0.5em; }

The following website has an interesting DHTML menu setup that is supposed to be accessable throughout all types of browsers with and without Javascript enabled, text only etc.  The licence is $15 USD for single use and $100 USD for multi use.  The site is http://www.udm4.com/.  The author is a sitepoint employee (brothercake) and has co-authored a Javascript book.