Jim has a nice set of answers to common REST questions/bogus claims -- some overlap with my own list, but good points:
- REST is simple.
- REST won't work in my situation.
- REST is all about CRUD.
- You can't do pub/sub with REST.
- Apart from UDDI, all the WS-* specs are new solutions to real problems.
- HTTP just maps to a database.
- If-Modified-Since is less accurate than and ETag and If-None-Matches.
- You only need to know 5 HTTP response codes: 200 304, 400, 404, and 500.