dual adsl

currently running a single 1500 mbs adsl , were about to add a second
and doing some routing , I have not don't this for ages so would
appreciate some help
currently the link to dsl is via an e-smith box.(maybe add a 3rd nic)
Im familiar with mandrake solaris and e-smith
lan machines include a dual winblows terminal server and mixed linux
and windows stand alone.
the adsl will be from differing upline feeds and we wish to simply
maxmise though flow as easily as possible
Thanks for any replies
G>
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Unix Rules... help your mates and introduce them.