Thanks for the good wishes, PP. :) Now if only we can get Narkissos back it'd be the old gang here.
Okay, I looked up the parallels between Papias and Luke 1:1:
Luke 1:1: "Seeing that many have undertaken to set in order (anataxasthai) a narration of the matters that have been fully assured among us..."
Papias (HE 3.39): "I shall not hesitate to arrange alongside (sunkatataxei) my interpretations as many things as I ever learned well and remembered well from the elders....Mark, who had become the interpreter of Peter, wrote accurately, yet not in order (ou mentoi taxei), as many things as he remembered of the things either said or done by the Lord. For he neither heard the Lord nor followed him, but later, as I said, Peter, who would make the teachings to the needs, but not making them as an ordering together (suntaxin) of the Lord's oracles".
Both are talking about the arrangement of gospel traditions in a narrative. It might be worth asking in what way Mark was preceived as deficient by the ancients (the lack of nativity and epiphany narratives may be one factor, at least concerning Mark in its present form).
Now which other gospels is the author of Luke talking about in Luke 1:1? I don't see that question often pondered. I think Mark and Matthew are prime contenders (I am not a firm believer in "Q" and consider Lukan dependency on Matthew a strong possibility), and it is interesting that no other canonical gospel mentions its posteriority to other gospels, which may be a sign of Luke's later date.