Push to Kindle 2.3 now allows you to exclude images from the ebook file generated. If you're already using version 2 of Push to Kindle, you'll find the new option when you click the 'Edit' button in the Preview column (or if you click the title of the article, which also puts you into edit mode).
Images are always enabled when an article loads in Push to Kindle, but we're wondering if this should be something you can set globally in settings - so they can be turned off by default, for example. Please let us know if this is something you'd like or if toggling them off on a case-by-case basis is good enough.
As always, all feedback appreciated.