Klout.com recently become more useful as it now updates daily – and seems to reflect more accurately twitter activity. Just out of interest I did a quick comparison of the klout score, as of today, for a range of university (mostly Swedish) twitter accounts.
This gives us some insight into how well our accounts are performing against others. True Reach seems less critical- for calculating the overall score- than the Amplification and Network scores, with Amplification having the most correlation with the overall Klout score.
The public tool only gives the overall figures, and does not provide any data over time, but – if you’re investing in your twitter account – then it does give some measure of the effect of your actions relative to your competitors. Keeping an eye on this, over time, would allow some identification of whether your competitors are pulling ahead in their use of twitter.