PSK31 and other digital modes

Yesterday I had a great QSO with Wayne, AK8D using PSK31 on 40m. Wayne told me about some other digital modes that I had heard of but have never tried. We swicthed to MFSK which proved very interesting as he sent me a small photo! He said MFSK is a great mode when the conditions aren't good for PSK31. Wayne also told me about MultiPSK which supports over 40 digital modes and is free. I will check it out and report back on my findings.