I love the Mac OS X Terminal and to do SSH with it. With increasing age I forget the many SSH connection variables. But with some AppleScript I help myself. Here now 3 simple examples.

Example 1:

User and target are hardcoded.

on RunTerminal()
    set ScriptCommand to "ssh user@123.456.78.9"
    tell application "Terminal"
        activate
        do script with command ScriptCommand in window 1
    end tell
end RunTerminal

on run
    RunTerminal()
end run

Example 2

Dialog for user and only target hardcoded.

global RemoteUser

on RunTerminal()
    set ScriptCommand to "ssh " & RemoteUser & "@192.168.0.1"
    tell application "Terminal"
        activate
        do script with command ScriptCommand in window 1
    end tell
end RunTerminal

on RunDialog()
    display dialog "Who should it be ?" default answer "root"
    set RemoteUser to text returned of result
end RunDialog

on run
    RunDialog()
    RunTerminal()
end run

Example 3

Dialog for user and list for targets.

global RemoteUser
global RemoteTarget

on RunTerminal()
    set ScriptCommand to "ssh " & RemoteUser & "@" & RemoteTarget
    tell application "Terminal"
        activate
        do script with command ScriptCommand in window 1
    end tell
end RunTerminal

on RunUserDialog()
    display dialog "Who should it be ?" default answer "root"
    set RemoteUser to text returned of result
end RunUserDialog

on RunTargetDialog()
    (choose from list {"192.168.0.1", "example.com", "123.456.678.9"} with prompt "What is your target ?")
    set RemoteTarget to result as text
end RunTargetDialog

on run
    RunUserDialog()
    RunTargetDialog()
    RunTerminal()
end run

After exporting as Executable you can put it on places where you want. Do not forget the appropriate icon!