At last, Illustrator can handle multipage projects. That critical feature, which has been Illustrator's weak spot for generations, finally provides a reason for users of older versions to update to Illustrator CS4. True, there are some other very nice capabilities introduced in the latest iteration as well, but the simple ability to create the front and the back of a document in a single file should thrill legions of designers who've repeatedly thought about switching to CorelDraw in disgust.
Granted, the implementation is a bit odd; not bad, as far as I can tell, just odd. With CS3, Adobe introduced a crop tool that allowed you to define sections that could be individually printed or processed by Acrobat. With CS4, the company extends those crop areas to act as separate Artboards, and each Artboard is sort of treated like a page. The benefit of this architecture is that the Artboards can be any size, so you can mix a variety of page sizes and types within a single document. Each Artboard is numbered like a page, and if you delete an Artboard, Illustrator will renumber to maintain the sequence. You can create a document with a predefined number of Artboards, or create them on the fly by simply creating a crop area.
If you actually use Illustrator for illustration, rather than page layout, you'll really like the Blob brush, which allows for more natural stroke blending. Rather than preserving each stroke as an individual path, it combines the strokes — or the erasures — in a single path. If gradients are your thing, the new interactive gradient widget makes creating and editing them a more streamlined process; plus it now supports transparency and elliptical gradients. It does bear saying that CorelDraw has also had these capabilities for several versions, though.
There are also a variety of subtle enhancements to program operation, including the ability to apply graphic styles additively. A few changes to the panels include a modification of the Appearance panel's operation — it's now an attribute editor, allowing you to toggle visibility or adjust parameters like opacity, blend mode, and fill colour — and the addition of a basic Separations preview panel for pre-preflighting colour. Adobe has improved (some might say 'fixed') Isolation mode, where you drill down into objects to selectively edit, to keep from enraging you if you deleted the only object in the isolation set. Live preview on clipping masks makes working with them a bit easier, and the Smart Guides now have little readouts that display basics like object dimensions.
Finally, there's beefed-up integration with Kuler, Adobe's social network for colour palettes, and improvement in Live Color operation. Illustrator can pull palettes directly from the Kuler site into the swatches panel as a colour group.
Althoough it looks like Illustrator CS4 will be a must-have upgrade, don't feel bad if you've got some lingering annoyance that it should have had these must-have features a couple versions ago.
