Top new features of Adobe Indesign CS3
(Taken from Adobe.com)

Creativity enhancements
Creative effects - Experiment with designs right on the page layout with Adobe Photoshop®-like effects. You can experiment with blending modes, opacity, and other effects without permanently altering your objects. In addition, you can save effects as part of an object style for easy reuse and sharing.

Finer transparency controls - Create complex visual effects by applying multiple transparency settings to a single object. You can apply transparency settings independently to an object’s fill, stroke, and content.

Improved text wrap - Easily flow text around objects. Wrap to a side or according to a clipping path or alpha channel.

Convenient Glyphs panel - Use the Glyphs panel to locate recently used glyphs, filter and sort glyphs, and save glyph sets for sharing and reuse.

Productivity enhancements
Multi-file placing - Import several different files in one step. You can see thumbnail views of the different files and cycle through them until you find the one you want to place.

Placed InDesign documents - Shorten the layout process and collaborate more effectively by reusing Adobe InDesign® CS3 documents. When InDesign files are placed in the document, the Links panel provides notification of updates, eliminating the need to save and manage interim files.

Expanded Quick Apply - Type a few letters into the Quick Apply panel and be able to access commands, text variables, scripts, and styles instantly without having to rummage around in different panels. You can also customize Quick Apply searches.

Fast frame-fitting - Set the default fit behavior of frames and assign fit options to object styles so that, as soon as you place a graphic or other content in a frame, it fits perfectly.

Visual Pages panel - Quickly navigate a document and arrange its pages using thumbnail previews in the Pages panel.

Nested style looping - Automatically apply a sequence of character styles within a paragraph with one click instead of manually formatting each style change. With nested style looping, you can repeat a sequence of nested styles until the end of a paragraph.

Table and cell styles - As well as applying styles to characters and paragraphs, apply styles to a table or to table cells. With table styles and cell styles, you no longer have to manually format tables or individual table cells.

E-mail-based assignments for InCopy workflow - Use new e-mail-based assignments to send stories and graphics as a single assignment package to any contributor in your small workgroup via e-mail. The e-mail package contains all of the information needed to update the layout with the added or edited content, so it’s easy to assign tasks and integrate contributions without the need for a shared server.

Export to XHTML - Quickly repurpose InDesign content for the web by exporting to XHTML. Styles can be mapped to an external CSS to instantly format your content.

Automatically generated layouts from XML - Automate the creation and formatting of documents by integrating InDesign content into XML workflows by way of XML rules. The conditional rules automatically adapt formatting and layout depending on content.

Support for XSLT and CALS tables with XML - Apply XSLT style sheets when importing or exporting XML content to make flowing XML into InDesign pages easier.

Agate measurement units - Take advantage of agate measurement units for newspaper publishing.

Support for long documents
Text variables - Automate the use of repeating elements such as headers, footers, product names, and date stamps. Running headers and footers can be generated from the text and dynamically updated as text flows from page to page.

Advanced bulleted and numbered lists - Create sophisticated lists with hierarchical, outline-style number sequences. Set styles, modes, alignment, indents, and other advanced options for different levels of bulleted and numbered lists. You can interrupt lists and spread them across different pages and stories.

More powerful Find/Change capabilities - Search and replace more efficiently with new find/change features. You can save searches, search across many documents, enlarge the scope of a search, and use GREP expressions in searches.

Customizable user interface
Customized workspaces - Save your panel and menu changes as a workspace and be able to call up your personalized workspaces any time. You can create different workspaces for different projects and tasks.

Customized menus - Get direct access to commonly used commands or simplify training on new workflows by color-coding or hiding individual menu items. Save customized menus as part of a workspace.

Enhanced Control panel - Rely on the context-sensitive Control panel to show you the most useful settings based on the objects you selected and the type of work you are doing. You can also customize the Control panel to show only your most frequently used options.

Flexible compact panels - Make more room for viewing your document while preserving instant access to your favorite features. View docked panels as icons to keep them accessible and easily recognizable.

Click Here for the Top New Features in other Adobe CS3 Programs