The free bilingual Con Vida guides are excellent and include detailed maps. Pick up the versions for Bairro Alto & Príncipe Real and Baixa & Chiado in trendy businesses in those areas.
For filtered cultural stimuli with an indie feel, check out the weekly Le Cool newsletter.
The GoLisbon blog is an amazingly comprehensive English-language site covering most everything in Lisbon, with a focus on what’s new.
Time Out Lisboa has a firm grip on upcoming concerts.