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.