- Anthologies get fewer submissions than equivalent-paying magazines, so your chances of acceptance of higher.
- Personally, I'm more creative when I have boundaries. An anthology provides a topic, usually an approach, and maximum and minimum word counts. I can come up with several ideas for an anthology story while watching a TV show, while I have a hard time corralling ideas, characters, and settings into something coherent when I have the whole of time and space to work in.
- Editors of anthologies sometimes arrange booksignings, increasing your name recognition.
- Editors sometimes arrange readings at bookstores or sf/f cons, increasing your name recognition.
- Being in an anthology is an automatic conversation topic when you meet other authors in the anthology at sf/f cons and meetings.
- Anthologies have deadlines. You can't put off writing your story or keep revising it; if you want to submit, you have to meet the deadline. If you write for anthologies, you get more stories out.
- Sometimes I write a story that doesn't match the guidelines of any magazine. A few times, I've sold such stories to anthologies, where they were a perfect fit.
Another source that I have not used often but other people swear by is Duotrope. Its search page is at http://duotrope.com/search.aspx. The fewer items you specify, the more hits you'll get. So to review all open paying anthologies in all genres, go down to the "Payscale" box and choose the minimum pay you want, go down to "Anthologies" box and click, then click "Search." Click on the title, and you'll go to Duotrope's summary. From there, you can go to the publisher's or anthology's Website.
The only bad experience I've had with anthologies is that they seem more likely not to respond if they're not interested.
I'll be blogging again at Novel Spaces on April 6. Hope to see you again then.