1) I love the idea that organisations are waiting for feedback on their products to come up on Twitter - I still await a response from Lexmark and/or Linksys to a comment I posted today about the evident incompatibility of my Lexmark printer and my Linksys print server ... I'm not holding my breath though, they did only cost £45 between them.
2) I use the 'search' capability quite a bit. I tried subscribing to a search on 'choral', but got disillusioned pretty quickly - it highlighted a problem with any subscription to Twitter content other than as a follower - people don't post the context of what they are writing. For this reason I am trying hard to make my posts meaningful when read in isolation.
4) I am puzzled by some of the people who follow me - I wonder what on earth they get out of it? It seems unusual to get a reply to a post.
5) I find an RSS reader (in my case SharpReader) an excellent vehicle for Twitter content.