I've downloaded the google desktop search program as it looks like a good tool and from the first 10 mins of using it, it looks incredibly fast. Why they chose to use AOL Instant messenger instead of Windows/MSN Messenger I'm not sure. I know hardly anyone who uses aol messenger, and even the people I know who use aol use MSN Messenger. Hopefully they'll rectify this in the future. After all MSN messenger is installed on all new machines by default so it would make sense to include this.
They also include secure web pages in the index by default - I'm not sure thats a wise decision but then again I'm not sure if it would find anything in the default configuration as I'm sure ie doesn't cache secure pages by default.(although on my machine it does cache the page so it might be the default setting after all).
Its possible to set urls to not cache, a good idea might be to pre-store address's of banks such as citibank.
It searches emails - if you use outlook or outlook express - which will suit most people just fine (although not me as I use theBat instead).
It doesn't support firefox's cache which is a big pain as thats what I use for most of my websurfing - again I hope that is a feature to come.
It's pretty cool how it integrates the search results into google.com by basically installing a mini web server.