Best solution for integrating mobile phones with Asterisk?

Mobile phone integration is now the top 1 feature on the wish list in the PBX business.
I would like to have a solution that integrates mobile phones with the Asterisk and offer a real ONE number solution.

It would also be nice to have the opportunity to control Asterisk feature directly from the mobile phone.
Do you have any experience in this field and what kind of products do you recommend?