Google Contacts

How can google make their contact manager more useful for their users (especially Google Voice users)? I have some ideas. Here they go:

1. Shareable groups (I.E. business and spam numbers for example)
2. Lookup of your number to see who has your number in their contact list.
3. Blockability of your number from any and all contacts in Google.
4. For Phone Type it should be labeled Landline and Mobile.
5. If you want to list the Attributes/keywords of a number allow that, (kinda already the "groups thing"
6. Reverse Phone number lookup across the board, you know google has all that data (most likely) already, why not make it easier. I don't mind a couple ads while I'm trying to find out who just called me.
   

Let me know what you think. Do you have any better ideas for Google to use for their contacts manager?