I tested the web site with Firefox on my Mac (OS 10.5) and with Opera in Ubuntu Jaunty and the AIR app on both machines and it installed and ran flawlessly. Although it doesn't work with inflected forms, it provides a list of the ten entries before and after your entry so as long as the word you're looking for begins the same odds are good you'll find what you're looking for; when an entry for an irregular form is provided (e.g., tuli, lātus, the third and fourth principal parts of ferō), if the original dictionary includes a cross-reference it's provided, but not as a link. As with the other electronic versions and the print, macrons are shown for the main entry but not in the quotations. Search terms cannot include macrons (and in fact the not-found mālum was located at the very end of the M section in the context list of 20 rather than among the ma's), but entries without them generate results for words both with and without.
This is a 0.2 alpha version, and they write of their plans:
We are busy cataloging every word in the dictionary as to its part of speech, declension or conjugation, gender, and other grammatical information. In the future, this will allow searches for "every first declension word that begins with R" or "every third conjugation verb that's deponent". We will also be adding maps for the geographical entries, pictures of items where appropriate, and updating some of the less-than-modern English Lewis and Short sometimes present.
My thanks to Terrence Lockyer, who kindly posted about it to the Classics list.