There are a couple differences between the original Samsung Instinct (M800) and the new Instinct s30. There are a lot of features that are exactly the same as well

Feature Instinct S30 Instinct M800
Weight 3.88oz 4.44oz
Demensions 4.61" x 2.16" x 0.52" 4.55" x 2.16" x 0.49"
Talk time 4.6hr 5.8hr
Browser Opera Mini Teleca Obigo
Calendar sync yes no
Mobile IM yes no
PC Sync yes no
Memory card, microSD 32gb 8gb
Data 1xEV-DO r0 1xEV-DO rA

Main features that are the same in both:

* 2mp camera
* GPS
* threaded messaging
* visual voicemail
* video capture
* customizable menus
* Phone book capacity: 600
* Internal memory: 32mb
* Display: 240 x 432

It should also be noted that in the S30, the proprietary operating system will more easily support third-party Java applications. In otherwords, the platform will be more open allowing developers to program around the phone's features (much like the iphone). However, similar changed are rumored to be planned for the original in the future.