Whoops, looks like my fault. We're moving from m2e 0.12 to 1.0 in the next JBoss Tools 3.2.1 release for Helios (Eclipse 3.6.2), and I suppose I moved the requirements site [1] up too soon.
[1] http://download.jboss.org/jbosstools/updates/helios/
To resolve those dependencies, you can either add this URL to Eclipse to get the bits we used for building JBoss Tools 3.2.0 (m2e 0.12.1 and m2e-wtp 0.11.1):
http://download.jboss.org/jbosstools/updates/requirements/m2eclipse/0.12/
Or, use these sites to install the latest 0.12.x content:
https://repository.sonatype.org/content/repositories/forge-sites/m2e/0.12.2/S/0.12.2.20110415-2017/
https://repository.sonatype.org/content/repositories/forge-sites/m2eclipse-wtp/0.12.0/S/0.12.0.20110421-1500/
https://repository.sonatype.org/content/repositories/forge-sites/m2e-extras/0.12.1/N/0.12.1.201101250603/
If you want to try our almost-but-not-quite 3.2.1 release, it's available here:
http://download.jboss.org/jbosstools/updates/development/helios/
Let me know if that solves the problem for you.