As a mark of a maturing software, this fourth update of iWork comes with commendable conveniences which makes it even much more useful.
All applications get a handful of additional themes added to its already wide library. Pages alone has a total of 242 themes, with templates for letters, envelopes, resumes, brochures, posters, certificates and so on. Keynote now contain up to a total of 44 slide themes. And lastly, Numbers with a total of 30 templates in its library.

New in Pages in iWork ’09 is the ability to write in full-screen to lessen distractions while writing to ultimately increase focus and productivity. Dynamic outlining is also introduced, where users can create a table-of-contents-like structure first where main and sub sections can be set first before actually filling the body of the document. There is also the new ability to mail merge with a Numbers document, so dynamic documents can be created. Pages can now generate documents (such as invoices or invitations) with differing fields but with the same document, respecting, say, a mailing list listed in a Numbers document. Pages can also now be used for entering mathematical equations for research or lab reports with the addition of MathType 6 - a point and click equation editor.
Numbers now allows you to easily create formulas by providing a database for mathematical equations with built-in help. There’s also the new formula list view to allow management of all calculations in your spreadsheet. Table categories are introduced in this latest iteration of Numbers, where you can group and organize data, paving the way for creation of more advanced charts.
For Keynote, a new slide transition is added, called “Magic Move” where you can place elements in your slide from one position to another and the relocation is drawn automatically for a stunning effect. More text and object transitions are added to Keynote, including chart animations to add movement and texture to 3D charts. A $0.99 app is also available in the iTunes App Store for a Keynote Remote where you can use either your iPhone or iPod Touch to control your presentations.
The whole suite has a new theme chooser with enhanced previews to easily find the best theme for your project. And there is a built in “Share” menu item for easy mailing and uploading, which can also port your iWork documents to a file format for each respective Microsoft Office counterparts.