@scottjenson referring to the truncation? I know what you mean, I made the conscious decision to ignore the length of truncated copies of my content as I didn’t want what felt like an unnecessary limitation of Twitter limiting my self-expression.
Others (Tantek Çelik in particular) care more about the quality of their POSSEd notes, and build UIs which inform them when their notes go over tweet- or retweet-safe lengths. This is one of the places diversity of implementations helps us experiment without having to argue about stuff :)
One interesting alternative is to spread the content of notes which are too long for a tweet over several tweets, but that leads to all sorts of weird directionality changes, potential for them to be interrupted, extra permalinks, etc.