Moody's last week issued a first public rating assignment to Zambia as it expands its rating of African economics. It has assigned Zambia a fairly strong rating of B1 (still far from investment grade though). According to Moody :
"The outlook on these ratings is stable. The B1 ratings reflect the following key factors: 1) Expectation of continued rapid growth, which should support economic diversification and over time increase the country's low wealth levels. 2) The country's track record of political stability, which benefits its developing institutional strength. 3) Zambia's low albeit improved financial strength, following debt forgiveness from official creditors in 2006"
The B1 rating puts Zambia better than some Eastern European countries and even some Latin American ones. It is a good indicator that things are broadly on track - as far as the markets are concerned. But of course markets think differently. More detail via Finanzen.