She must have gotten drunk and went beserk lol.
just kidding...
Seriously though Konata's popularity amongs people maybe because in every episode she shows new faces, styles of laughing, giggling, movements and she's pretty entertaining just look at her face it'll give you a smile in no time. Kagami on the other hand is a tsundre, which is "ALWAYS IN" and popular amongs many anime fans. Tsukasa is the gentle/nice type girl that is somewhat forgetful sometimes which is quite good and cute that makes her likable and as for Miyuki like Minoru said, she's kind, gentle smart eaasy to approach and has big busts and another plus is her glasses, the nerdy clumsy girl that is the in betweener among the group is never least.
But I always go for the most unique girl in ANY anime seires. As for now Konata hits me my heart HARDER than any other anime girl characters i've seen this '07.