Here are a few ways to use your talent to help out:
Benefit concert - This doesn't have to be a large event for you to make a difference. Grab a few folding chairs and have a simple house concert. Invite other local bands and jam on. You can either charge a cover at the door, or just have people throw their donations in the guitar case. When promoting this, make sure everyone knows that all proceeds will go to the charity you have chosen.
Gig proceeds - If you are getting a cut of the door or even a flat fee to play a gig, dedicate a portion of it to be donated. Let the bar/club owner know that a certain portion of what they pay you will go to charity. See if they will match it. If so, make sure to mention that in any of your marketing materials.
Write a song - If you're a singer/songwriter, grab your guitar and bust out a quick acoustic inspirational tune. Market it online and let everyone know they can download it for a donation.
Percentage - For the next week or two, donate a portion of all download, CD or merch sales to charity. Make sure you add some text above your Album Download or Store feature letting your fans know you are donating ___% of all sales to charity name that will benefit Haiti relief efforts.
Email blast - Send a mail out letting your fans know what you are doing to help. Also, include a few links to charities they can donate to. In your email, you can say something like, “Email me your donation receipt and I will email you my song/album for free”.
Donate personally* - Times are hard, but I guarantee times are much harder in the middle of devastation. Donate whatever you can. A little goes a long way. Here are some Haiti relief resources: http://www.google.com/relief/haitiearthquake/*As a company, Bandzoogle will be matching all employee donations to support Haiti relief efforts.