1.
Gmail Custom Time: Be on time. Every time.
2.
Wake-Up Kit: Wake yourself up.
3. "I'm Feeling Lucky" button for Calendar
4.
Book Search - Scratch & Sniff: Search now smells better.
5.
Adsense for Conversations: Puts the 'context' in contextual advertising
6.
Virgle: Things will get better. Eventually.
7. File --> New Airplane in Google Docs
And my personal favourite:
8.
G'Day: Search tomorrow's web, today! (be sure to check the
FAQ page)
[Edit: Couple more]
9.
Featured Videos on YouTube: You've been Rick Roll'd!
10.
Google Weblogs: The next revolution in personal publishing
11.
Google Talk Goes Green: Add en2im@bot.talk.google.com as a contact
12.
AdWords FrankRank: Rankings based on how well a particular ad goes with mashed potatoes and gravy