The merthur_glompfest used this for the fest this year. Non-writers posted their prompts, and then at a designated time they were open for claiming. I was glad there was a browsing period, because there wasn't an easy way to sort through the prompts that I knew about, so I just had to read each one. Although all the prompts were the same ship, so maybe that's why. I liked how claims worked and I liked that when I posted my claim, the whole prompt showed up in the notes box.