6 jQuery snippets you can use to manipulate select inputs « Flexible Developments
http://calisza.wordpress.com/2009/03/29/6-jquery-snippets-you-can-use-to-manipulate-select-inputs/
11 jQuery Plugins to Enhance HTML Dropdowns | Steve Reynolds Blog
http://www.reynoldsftw.com/2009/03/11-jquery-plugins-to-enhance-html-dropdowns/

<draco> http://www.reynoldsftw.com/2009/03/11-jquery-plugins-to-enhance-html-dropdowns/

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Giva Labs - Linkselect jQuery Plug-in | Giva

jquery.timepickr was created in a attempt to make the process of inputing time in a form as easy and natural as possible.

Not perfect, but an interesting time picker implementation.

timepikcer

A time selector with a very ergonomic UI -- pick hour, minute in 15 minute increments, then am/pm.

jquery time picker

jQuery UI Multiselect - http://www.quasipartikel.at/multiselect/

Another attempt of a sortable, searchable multiple select widget It depends on jQuery 1.3 and jQuery UI 1.7. The widget is styleable using Themeroller. It works in an unobtrusive fashion, by just turning html multiple select inputs into a sexier equivalent. There's no extra markup needed. For installation instructions please have a look at the corresponding blogpost Source code is available at Github In case you are looking for the original version, it has been moved here Bleeding Edge Demo is always available here (thanks to Github Pages)

選択項目をウィンドウ間で追加削除できるプラグイン

Converts html multiple select inputs into slicker interfaces. It makes searching within the options possible which is very functional for large lists & selected items can be re-ordered by drag’n drops.

crossSelect jQuery plugin demo - http://wheresrhys.co.uk/resources/crossSelect/crossSelect.html

combo de multipla selecao

$("#myselect option:eq(0)").after("<option value='4'>Some pears</option>");

$("#myselect").val("Some oranges").attr("selected", "selected");