Equitice

Summon a pack of buffed tamed wolves on top of you with a fishing rod as seen in Flamefrags' Unstable SMP videos.

Give items custom color-coded names with /rename in chat. Client-side, works on any server.

Low durability fishing rods that call orbital strikes, there are two shot types, works in both survival and creative

Client-side pvp score overlay with player heads, themes, and auto server detection for applicable servers.