k-notes widget 2.0 (by rakoth's devstation)
The k-notes widget provides an alternative to Apple's stickies widget with more functionality.

Notepad Widget 1.0 (by Stewart Hector)
Tiger comes with the Stickies widget, which is pretty good.

Sticky Spawn 1.1 (by 1Up Comic)
Sure, Apple’s Stickies widget is great, but it’s such a hassle to open a new note.

HTMLTest Widget 2.0 (by Muskrat Waltz)
HTMLTest Widget lets you test out HTML, CSS, and javascript code in your Dashboard.

NoteList 1.2.1 (by Tension Software)
NoteList allows to store notes in a free form using text and images with full word processing capabilities.

Graphite Widget 0.5 (by Scott Reynen)
Graphite is a free widget for Apple's Dashboard.

inkBook 1.0 (by Mage Software)
inkBook is a note-taking application.

Lodist Widget 1.2 (by Andre Smith)
Lodist widget it a dashboard widget that allows you to search the growing Lodist Classifieds.

Word of the Day 2.0 (by haym37)
This widget will display the Word of the Day from dictionary.

Word Counter Widget 1.2 (by SuperMagnus Software)
The Word Counter Widget is a Dashboard Widget for Macintosh OS X.

PricePoint 1.0 (by The Mac Support Store)
This widget helps you keep track of the changing prices at The Mac Support Store.

To Do Tracker 1.2 (by Monkey Business Labs)
To Do Tracker widget helps you stay organized by putting a handy notepad right on your dashboard, designed especially for quickly making and sorting lists.

iClip lite SE 2.0.1 (by John Casasanta & Piotr Gajos)
Store images, text snippets and links in this widget's many wells for quick access.

Graphing Widgets 10.4.1 (by VVI)
You can turn your data into graphs and present those graphs on the Dashboard.

DoBeDo 2.4 (by Ron Morrison)
DoBeDo allows you to view, add, edit and delete iCal’s todo items.