Library clips

Callwave - voicemail-to-email forwarding

GrandCentral - one phone number to ring all your phones

Pinger - send a voicemail to multiple people in one go

Built Smarter - add modules to your existing website eg. blogs, shopping carts, ads, formsm links, feeds, files, calendar, IM, polls and more

Texterize - is a free text message board, that you can use to receive SMS text messages from mobile phones. You or your friends can send messages to a widget in your blog when you don’t have access to a computer (don’t think you can directly enter a message into the widget itself, it’s purely SMS).
I wonder if the owner is SMS’d notifying someone has left a message. A feed might also be handy to follow the messages (perhaps even convert the feed to SMS or email to be notified).

GoToMsg - Lets you schedule text messages to be sent to your email or cell phone. This lets you remind yourself of important upcoming events. I guess the many notes, To-Do, Task, Time services probably have this function, but this is a real simple tool…get the widget.
Another similar service is rminder and SMSzilla, FutureMail and TimeCave do it for email, ReminderFeed, FutureRSS do it for RSS, and ToolTask for IE doesn’t it for web surfing.
Or just get some Time Management with SlimTimer.

WaxMail - record an audio file and send the mp3 as an Outlook email attachment. Others are Slawesome, Springdoo and vemail.
MT1 is the other way around.