So, we met the Murderhobo yesterday (although written for Labyrinth Lord, he can easily be used with any OSR system to derail most any campaign ;) and it got me thinking about multiclassed characters.
For me, my favorite multiclassed characters have either been the straight up Cleric with a high strength (allowing him to be a very effective fighter up to at least mid levels) or the Magic-User / Thief. There is an awful lot of synergy between magic and thievery. Both classes tend to avoid front line (or any line) of direct combat.
Actually, if were playing with gnomes, Illusionist / Thief might have even better synergy than MU / Thief, especially if one is looking to enhance their thievery side.
Never saw much of a need for a Fighter / MU and Cleric / Anything is pretty useless, as a cleric is pretty much a spell casting fighter in any case.
So, what is your favorite multiclass combination?