You can find bookmarks of all the Jo Walton poetry I've enjoyed on my pinboard here! Some of the older stuff might have broken links though, from when she shut down her LJ.

If you want somewhere specific to start, since she's written a heck of a lot of poetry, here's a few I've particularly enjoyed:

The Flight Into Egypt
Another Poem About the Weather
Eucatastrophe Poem
Is This the Face?