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I thought PhotoShop 6 compression algorithms were a bit weaker than Fireworks, especially for jpg, but Adobe took a big leap with version 7. I haven't found a need for any other plug-in or program in a long time.
In fact, some of the results that Adobe now gives blow my mind - especially the way it handles sharp lines and high contrast edges in a jpg.
If you do use the built in save-for-web optimizer in PhotoShop, you can get crisp lines on vector shapes and text by clicking on the 'circle in square' icon next to the quality settings. you can then select to use the text or shapes and have them at a higher quality than the rest of the image.
The file sizes are a bit bigger but sometimes it is worth the difference.
Make sure Photoshop isn't running, or you will have to restart it before it will work.
how do I access the plugin to use it?
In the "save as" menu, you will see an option to save it as a BoxTop ProJpeg image. The plugin will then load allowing you to set the compression level you need.