Suggestions on data replication

For a Windows-only site with a couple of Win2K clusters, SQL, Exchange,
Citrix, and IIS I'm looking to build an overview of viable ways of real-time
or near real-time replication of data to a remote site. No access to raw
fibre, just TCP/IP with decent bandwidth (30-50Mbit/s dedicated).

I'd like to hear from any software-only, hardware-only or combined
installations, with good or bad results. Things like Legato co-standby
server or Veritas storage replicator, but also Netapp snapmirror, EMC SRDF
or what not. Remote clustering with Windows2003 anyone? Please share your
experiences.

All info appreciated..

Rob