Initial Thoughts and enhances that need to occur
First and foremost after install the app should bite the bullet and just index everything. Period. Get it over with. As it stands I'm sitting at only 112 items indexed. At this rate it might be done by the time it comes out of beta. If it is process intensive the app at the very least should be smart enough to query the CPU speed, amount of RAM, etc and determine if it can do a comprehensive scan immediately on install. We aren't talking brain surgery here.
Second the prefs are way to neutered. This could partly be because this is beta software but even beta usually suggests the core components of the app are present. I think it somewhat stupid that you can't specify how much idle time must occur before the app starts indexing. I should be able to select something like 1 minute, 5, 10, 30, 45, 60, 1 hour, 2 hours, etc.)
Beyond that there is the whole browser experience thing. I do like that its compatible with FireFox out of the box. Thank you Google. However I hope Google cleans up the interface before it's officially ready to go. If this is supost to be a desktop search it should be seamless. A simple browser window with a Google search screen in it feels. Hard to describe. Too webish. Get rid of the buttons, the bookmark bars, the status bar on the bottom. Make it look more like an app instead of a simple webpage because you can be sure as hell that when MS comes marching in with whatever solution they have its going to look a lot cleaner then this. That being said if I go to Google and click desktop sure. I'm initiating this from a browser. You shouldn't expect Google to screw around with an existing browser window but when its spawned from Windows itself? Yah a little cleanup is in order here.
Third the data results are in the form of your typical Google results. I'm a big fan of Google. I like it. It works well. But the layout doesn't get the job done for local file searches. There needs to be a data: created and modified field. There needs, and this is personal pref I guess, a physical snapshot of the file to the left of the entry that is slightly larger then MS's thumbnail view in their File Explorer. You shouldn't have to click on the cache link to get a basic idea of what is in the file. We have come a long way from the days of simple text results being spit out from command lines. Results deserve more then simple text overviews. The GUI OS is there to give us visual feedback. Lets use it! As for the previously mentioned cache link. What is there to say? I'm going to be picky about how my data is being formatted and especially picky about how my data files are being previewed. Call me silly but if I click a cached link on google I expect a web page not a dump of the text. I understand that this is going to be very difficult to achieve but frankly, to be blunt, if you don't do it I'm betting Microsoft will. I don't think basic formatting of xls, word, and ppt text is uncalled for. At least give us an idea of what we are looking at instead of a pure dump of the text.
Also and this is a big one. The searchable items are WAY too rudimentary. Right now it only supports: Outlook and Outlook Express, web pages in your history, AIM, Word, Excel, PowerPoint, text files. That's a good start. How about PDF's? How about saved HTML\XML documents? How about picture names and descriptions? How about Lotus Notes or even G-Mail searches? (Yah there are other mail clients out there guys.) How about iTunes or simply music file searches? There is a whole host of data types out there to be queried and while this util does an adequate job at getting the basics covered its hardly comprehensive.
Overall for a beta its somewhat disappointing. If Google is planning on enhancing the features vs. simple bug cleanup, which beta software typically encompasses, then I'd consider it a solid start. As it stands there is A LOT of work that needs to go into it before I would use this consistently.
I'd give it 3 out of 5 stars right now.