The recession and liquidity situation mean that it's a particulalrly bad time to be public and very few media companies in the UK ever find a decent level of liquidity on the public markets. AIM seems to largely exist to furnish investment banking fees.
Which brings me to the company I founded and took public in the US, Narrowstep (NRWS). The company is currently trading at 4c; the shortcomings of the US management team who contrived to take control of this company was well documented by a former independent director, but the valuation is ludicrous for a company that has revenues above its market cap, excellent technology and a very good CDN.
The lesson for anyone involved in this industry seems to be to aim for a trade sale and ignore the public markets.