It's been another frantic year for famous do-gooders. Love them or loathe them, celebrity humanitarians have helped train media attention on crises from Darfur to Haiti.

Some celebrities are respected spokespeople for their chosen causes, helping to mobilise public opinion, raise funds and influence policymakers.

Others are less effective in commanding respect.

As the year draws to a close, we're asking which famous faces have given the best - and worst - name to "celebrity humanitarianism" in 2007.

We've consulted with aid agency experts to come up with a shortlist for the public to vote on - but feel free to make your own choices.

There are five celebrity categories - actors, musicians, athletes, philanthropists and leaders.

Please take a couple of minutes to complete our poll.

To see results so far, click here. Final results, including the overall best and worst, will be announced at the end of the year.