I have faith in integration, & @PhilTurpin ...
to the extent of cautious use of these Google products:
Alerts
Android
App Engine
Blogger
Bookmark
Buzz
Calendar
Checkout
Chrome Sync
Cloud Print
Contacts
Docs
Gmail
Google +1
Google Sync [MS Outlook & OE/WinMob/Nokia/SE]
Groups
Hotpot
iGoogle
Latitude
Maps
Mobile
News
Notebook
Picasa Web Albums
Places
Product Search
Profile
Reader
SideWiki
Sites
Social Circle & Content
Subscribed Links
Talk [text/video/audio]
Tasks
Voice [Gmail & US]
Wave
Web History
Youtube
[just about the only item I purposefully exclude is Desktop Search, as I find Copernic more stringent in its results].
Clearly there are privacy & Security considerations in surrendering this range of data to a commercial organisation in exchange for its services. I've taken the view that: given the sheer intensity of scrutiny of my personal information by public & private organisations, and how easily this is leaked [often simply resulting from lowest-priced tendering, leading to ramshackle under-staffed & under-policed service], my best defence is not in privacy or anonymity - it's in mundanity. My information has so little variance, it's so average, that it's of minor use beyond its role as an aggregate in mass consumer information. Sure - my phone calls could be listened to, my location & practices tracked, and my credit card hacked; but I don't say anything particularly interesting, I don't go anywhere that unusual or in a flamboyant fashion, and I keep my credit card limit low. Essentially, in my goldfish bowl I swim amongst a shoal of minnows; gambling that's it's the colourful, animated big fish that will capture the attention of predators.