In case anyone needs to know, the official programme of events is here

http://www.cm-albufeira.pt/NR/rdonlyres/8DA40A51-EF2C-4FFC-A953-37EE893A2D44/0/FIM_DE_ANO_2009.pdf

It's only in Portuguese but you'll get the gist easily enough.

The main bits of interest will be the concert and fireworks on the Praia dos Pescadores (Fishermen's Beach)

2230 The Gift (Portuguese rock band)

0000 Fireworks

0030 Madcon (Norwegian Hip-Hop duo)

You can Google the bands to find out more about them.