load balancers?

["Thomas O'Dowd" <tom@example.com>]

What kind of load balancers are people using out there? I'm looking
for an appliance that works well in a linux environment that is able
to manage sessions etc intelligently across a couple of web servers.
It should know if one of my servers goes down and hopefully not be
too expensive :)

Thanks,

Tom.
-- 
Thomas O'Dowd. - Nooping - http://nooper.com
tom@example.com - Testing - http://nooper.co.jp/labs