This plugin extends the category and archive lists by providing a dropdown (select) box that auto-navigates, or with a button or link to activate the …

Brian

Ajax Dropdowns

Display a group of posts that can be switched using dropdowns.

Robert O'Rourke

Dropdown Menus

Display your WordPress menus as a dropdown select box. Great for mobile designs.

Daniel J. Summers

Daniel’s DropDowns extends the standard WordPress category and archive template 
tags. It provides a category dropdown that uses the standard WordPress link 
tags for its targets, so it will work with the standard permalinks, or any 
form of “pretty” permalinks. The archive dropdown is a lot simpler, as that 
template tag will create option entries with the proper links.
Dropdowns can also include buttons or links to activate the current selection, 
or (as of version 2) be rendered as auto-navigating select boxes. Also, as of 
version 2, you can specify the text that will appear in the link or on the 
button.
NOTE FOR 1.0 USERS – As of version 2, the CSS parameters have been removed, as 
each item can be uniquely identified without it, and will use the CSS of the 
theme if none is specified. There are notes in the plug-in that explain how to 
write CSS to address these elements, and also explain the (now 2) parameters for 
each tag.
NEW FOR 2.0.1 – There is now a “Select Category” option in the category 
dropdown, and it is the default. This allows the auto-navigation to work 
properly for the first category in the list.
NEW FOR 2.1 – The “Select Category” option was not correctly displayed in the 
2.5-series, due to an extra space in the category dropdown output.

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