software recommendation for wire-framing web-app with free (for single user) tier

Hi,
I'm a programmer looking to make lo-fidelity mock-ups of some proof of concepts. Looking for an online design tool that is free for single users.
I'm looking for a wire-framing tool that allows very fast simple lo-fidelity 'designing'.
I don't want to spend much time creating detailed designs, just something throwaway that I can use to show people, put an idea across of how an interface would work/look, and get feedback – then iterate.

If this isn't the right group to ask, suggestions on where to ask are welcome, thanks.

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