If you're looking to augment your cell phone coverage at home, and you're a T-Mobile customer in Seattle or Dallas/Fort Worth, they've finally unveiled their T-Mobile @Home service
For $10 a month and the investment in a $50 router, you'll be able to add VoIP service to your home. The service, called Talk Forever Home Phone, gives you unlimited calling nationwide, caller id, and voicemail. You can assign the "line" it's own phone number, and use any standard telephone.
If you've got spotty cell phone reception or simply want to keep a dedicated line at home, T-Mobile is offering an inexpensive and simple solution.