In Google Analytics, go to “Traffic Sources” > “All Traffic Sources” and if you filter by “google”, you may notice a variety of referrals from Google.

Google Analytics showing all traffic sources filtered by "google"

Now, to know how “google.com” is sending you referrals, go to “Traffic Sources” > “Referring Sites” and filter by “google”. You will see a list of Google domain names similar to the previous screen.

Google Analytics showing referring sites filtered by "google"

Finally, just click on “google.com” and you should be able to see the referral paths.

Google Analytics showing referral paths from "google.com"

So, yes. Google can send you non-organic traffic from its other web properties like the Google Reader or Google Bookmarks.