Diane,
Just read up on the 3005 from here:-
http://www.cisco.com/en/US/prod/collateral/vpndevc/ps5743/ps5749/ps2284/product_data_sheet09186a00801d3b56.html
And it clearly states:-
"Cisco VPN 3005 Concentrator
The Cisco VPN 3005 Concentrator is designed for small to medium-sized organizations with bandwidth requirements up to full-duplex T1/E1 (4 Mbps maximum performance), with support for up to 200 simultaneous IPsec sessions or 50 simultaneous clientless sessions. Encryption processing is performed in software. The Cisco VPN 3005 does not have built-in upgrade capability."
Cisco VPN 3005
Simultaneous IPsec Users - 200
Simultaneous SSL VPN (Clientless) Users - 50
Maximum LAN-to-LAN Sessions - 100
Encryption Throughput - 4 Mbps
Encryption Method - Software
I'd say your OK to go with another few L2L VPN's! BUT I would caution - the encryption is software based, the higher the encryption level the more CPU cycles required, the more memory used!
HTH.