Google researched del.icio.us bookmarking service to list top 10 bookmarked Google services. According to the list Gmail and Writely are the most popular services. "Not yet in the top 10, but pretty close: Blog Search, Sketchup, Book Search, Page Creator, Google Moon, and Spreadsheets."
1. Gmail 16000+
2. Writely 15143
3. Search 7675
4. Maps 6197
5. News 5130
6. Reader 4745
7. Video 4307
8. Scholar 3215
9. Labs 2720
10. Earth 2583
Google search is not included in the list since it may be argued that Google.com is very well known and there is no need to bookmark it.
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