Thanks, John and Ingar!I will try the "parallel" and "parcolums" packages first (of which parcolumns seems much more mature at the first glance). They appear to provide just what I need, while ledmac/ledpar seem to be overkill for me. Yet another package, "paracol", was mentioned somewhere, though the link there was dead and I could not find anything else about it on the web.
Lyx integration would be nice, but I do not think I can do this anytime soon. Maybe someone else will: I just noticed that ledmac/ledpar support is on the feature poll in the wiki: http://wiki.lyx.org/LyX/FeaturePoll2 (under "Package support").
Carlos
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