I have had the opportunity to play with the beta as well, and I must say, I'm impressed. For the last six weeks or so, I have been working on a little something I like to call Project DVD -- wherein I try the various DVD cataloging programs (though most can catalog more than just DVDs) and find the best one to tackle my truly mammoth collection -- and it's great to have DL2 in the mix.
Just from my own experiences, what has impressed me most about the beta -- aside from the various UI changes/eye candy -- is just how much easier it is to add items.
Because I have so many DVDs, it's often faster for me to enter in titles by hand rather than relying on the iSight scanner. No matter how accurate the scanner may or may not be, holding a title up to my laptop is usually going to take longer than just typing in the name (granted, using a USB scanner like Motorola CS104 is a great solution, but at $100 OEM, you really have to weigh the expense to convenience). My biggest problem with Delicious Library (and in fact, almost all of the programs I have tested for Project DVD) has been that adding multiple titles at one time (say, multiple seasons of a TV show) has been either really difficult or impossible.
Read for the rest of my thoughts, and be sure to visit the gallery below for all the screenshots.
Out of the box, Delicious Library 2 comes equipped to deal with more than just DVDs. Your iTunes library is immediately catalogued, with album art standing in for jewel cases and types of media separated by type - Audio Books get their own shelf, for instance.
Delicious Monster has made it clear they want to be the source for all of your collections - be it books or power tools. Comic book support isn't there yet (just thinking about the logistics involved with creating and accessing a comic database leaves me slightly dizzy -- DM says Comic support is something they want, but getting the product out the door took obvious priority). I have to admit, it was pretty cool to be able to find the jeans I happened to be wearing when taking the screenshots for this write-up and add them to my "Apparel" shelf. Amazon.com is still the main repository for where you items are located, so what you can add automatically is limited to that (admittedly vast) catalog. You can still add your own original entries.
All in all, I'm really, really impressed with how Delicious Library 2 and how it has evolved. The eye candy is nice, don't get me wrong, but what really makes me excited is how much more functional the program is from a productivity standpoint, specifically in adding lots of items at one time and publishing your collection to the web.
Delicious Library 2 is on track to be released sometime in March and is Leopard only. If you purchase the current version now ($40 USD), you can upgrade to DL2 for free.