You're getting confused between snapshots and filesystems.  Read @ as "at", 
it's a snapshot of that filesystem at a particular point in time.  eg, you 
could create snapshots with names like:

z1/proje...@now
z1/proje...@13-july-2009
z1/proje...@my-snapshot

They're all snapshots of the z1/projects filesystem, and you can use almost any 
name you like.

To send your filesystem to another machine, here's a quick overview:

System1:  contains z1/projects
System2:  has an empty pool z2

1. Take a snapshot:
zfs snapshot z1/proje...@now

2. Send the snapshot to z2
zfs send z1/proje...@now | ssh u...@remote.system zfs receive z2/proje...@now

3. End result:
Two identical filesystems on each system called:
z1/projects
z2/projects

Each of which has a snapshot of the data from the point you started:
z1/proje...@now
z2/proje...@now
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