So here's a follow-up to the earlier GDS post.
I'm not really going to do a full review, mainly because I'm still sticking to MSN Desktop Search which, for me personally, is still a better product overall. But let's just look at the good and the not-so-good that this final release of GDS brings.
The Not-So-Good:
- It still uses a darn browser window to display search results - what a terrible idea! I wasn't expecting this to change between the beta and the final, to be honest, but this still falls into the not-so-good (and possibly even the bad) category nonetheless. MSN DS uses a shell namespace extension (no, it's not IE, people) to display full search results. The great thing about this is that it allows you to use all the nice Explorer-like functionality such as context-menus, drag-and-drop etc which, in my opinion, is a must for an app that works with lots of files. Every other desktop search app does it...why not Google's?
- There's a deskbar now, similar to the one in MSN DS. Unfortunately, it's not quite as functional. It's just a text box that you type the query into, hit enter and get the results in the...yes, you guessed it, browser window. There's no instant find-as-you-type the way MSN DS does it...which is just really cool and very convenient.
The Good:
- The API! Remember Ballmer's words, MSN - "developers, developers, developers!"

GDS now includes an API that developers can use to integrate its search functionality into their own apps. This is wonderful. MSN can definitely one-up them if they offer something similar soon, especially since MSN DS already has the advantage of having find-as-you-type. Give devs a way to integrate the deskbar into their own apps!
- Support for Thunderbird. MSN DS currently indexes mail only from Outlook and Outlook Express, and I don't see that changing anytime soon, unless a third-party IFilter comes up for it. I personally use Outlook 2003, so I'm more than happy with MSN DS, but GDS is a nice alternative for Thunderbird users, although it doesn't offer a handy "Show Conversation" feature like MSN DS does. (no context-menus, remember?).
So that's that. My verdict - MSN DS wins this round. Power-user features like aliases and application launching through the deskbar have also become indispensable to me (I don't have any shortcut icons lying around anymore). The MSN folks just need to get an API out, and they'll be all set.
If you use Thunderbird for email and you don't mind giving up features like aliases and app launching, I'd personally recommend Copernic Desktop Search rather than GDS. Copernic supports Thunderbird, has a deskbar with find-as-you-type, and brings up the context-menu when you right-click on search results.
Honestly, I was expecting GDS to offer something completely unbeatable with their final product. After all, they did it with their web search engine, didn't they?