Available is the Send SMS Dashboard Widget 1.6.1.

New features:

Support for sender ID for most mobile networks in the US.

Bug fixes:

Now supports startup volumes which are formatted Mac OS X HFS+ case-sensitive.
Send SMS was not able to load some Address Book data. This is now fixed.

The Dashboard Send [...]

Available is the Send SMS Dashboard Widget 1.6.
The Dashboard Send SMS widget is now Universal and is compatible with the new Intel Macs.
It also adds the email2SMS feature which allows you to send free SMS in the USA & Canada, provided you know the mobile operator of the destination mobile.
More online documentation about email2SMS.
Please send [...]

Simultaneously available are Send SMS 1.5, the award-winning Dashboard
widget, the Send SMS 1.5 Yahoo! Widget and the SMS Mac 1.5 Address Book
plug-in. Version 1.5 adds the possibility to receive an SMS reply at your
email address and adds new help documentation.
To download version 1.5, goto the downloads page.

Version 1.1.2 of the Send SMS Dashboard Widget has been released.
Fixed:

bug in French localization file

bug in handling of manually added numbers

Added:

French tooltips

context-sensitive online help (fix of 10.4.3)

To download version 1.1.2 goto the downloads page.

Today SMS Mac has released version 1.1.1 of the award winning Send SMS Dashboard Widget. This version improves the integration with the Address Book and fixes some bugs. The changes are:

Persons with multiple mobile numbers will have multiple
entries in [...]

SMS Mac 1.1 is released today. This version includes:

Delivery reports. An SMS delivery report confirms that the SMS has been received on the mobile of the recipient. Delivery reports are supported [...]