One marketing approach which I've enjoyed watching is the route Intronaut has taken the last few years. Around five years ago everyone was using Myspace and when users migrated away from it, I think a lot of bands who relied on it lost an effective resource.
What I noticed these guys doing around that time was releasing a lot of documentary style Youtube videos. They had vids scoping out their rehearsal space and gear, the drummer explaining how a polyrhythm or the time sigs in one of their songs worked, the guitarist teaching his guitar part... stuff like that, even though they were basically still getting established. In an age where younger kids look every kind of info up on Youtube, I think it made/makes sense.
I think you need a little more technological savvy to do that type of thing, but it's my favorite approach I've seen in recent years (being a marketing nerd professionally). I think it provides a good mixture of promotion/hype, information for those who were curious, and helped the guys in this band look more legit.
The last part of this video has some cool fretless playing (used in a song that has a little Justin Chancellor thrown in)... great growly tone!
INTRONAUT - In the Valley Of Smoke Pt II - YouTube
Anyway... the more thought and *consistent* effort you spend on promoting and marketing your band, the better results you'll have. Sometimes it takes months of handing out hundreds of flyers before things start catching. I'm just saying... don't make an effort once and be disappointed if the immediate results aren't noticeable. I think if someone hears about your band 3-5 different times, they might possibly show... at least they'll think you aren't fresh out of the garage.