thinking about it, then it isnt possible to use 2 dsl connections at the same time without some sort of software.
the SME Server knows on which lancard to send all traffic, and the problem woulöd be telling sme to send some traffic out on 1 card and "other" traffic on another card.....
If you realy need redundancy or even a faster connection then get a 1 or 2 MB line...