Steps to reproduce:

0. Create a simple maven 3 project
1. Enable Resource Filtering
2. Add a resource file with this content:
SERVER_VERSION=${project.version}
SERVER_BUILD_DATE=${timestamp}

3. Add a property to the pom (to work around http://jira.codehaus.org/browse/MRESOURCES-99)
<properties>
<timestamp>${maven.build.timestamp}</timestamp>
</properties>

4. Executing mvn help:effective-pom shows

• The WRONG Result on hudson: .... <timestamp>${maven.build.timestamp}</timestamp> ....
• The correct Result when you run it on a local machine: <timestamp>20110121-1512</timestamp>

5. Because of the behavior described in step 4 the resource filtering is not working as expected:
SERVER_VERSION=2.3.0-SNAPSHOT
SERVER_BUILD_DATE=${maven.build.timestamp}