BlazeDS Vs LCDS

Many people think that BlazeDS and LCDS (Live Cycle Data Services) are the same thing, they are wrong. BlazeDS is just a part of LCDS. Sujit Reddy G has created a great table in wich we can see the differences between both services:

Features	BlazeDS	LCDS
Data management Services
Client-Server synchronization
Conflict resolution
Data paging
SQL adapter
Hibernate adapter
Document Services
LiveCycle remoting
RIA-to-PDF conversion
Enterprise-Class Flex application services
Data access/remoting
Proxy service
Automated testing support
Software clustering
Web tier compiler
Enterprise Integration
WSRP generation
Ajax data services
Flex-Ajax bridge
Runtime configuration
Open adapter architecture
JMS adapter
Server-side component framework integration
ColdFusion integration
Offline Application Support
Offline data cache
Local message queuing
Real - Time Data
Publish and Subscribe messaging
Real -time data quality of service
RTMP tunneling

For anyone thinking about using BlazeDS or LCDS I would recommend to read this Sujit entry about both options performance.

Hope it helps :)