I tried to install JBT from http://download.jboss.org/jbosstools/updates/stable/helios/ and got:

Cannot complete the install because of a conflicting dependency.
Software being installed: Teiid DataTools Connectivity Feature 7.1.0.v20110215-1224-H420-GA (org.teiid.datatools.connectivity.feature.feature.group 7.1.0.v20110215-1224-H420-GA)
Software being installed: Teiid DataTools Connectivity Feature 7.1.1.v20110421-1417-H167-GA (org.teiid.datatools.connectivity.feature.feature.group 7.1.1.v20110421-1417-H167-GA)
Only one of the following can be installed at once:
Teiid DataTools Connectivity Feature 7.1.1.v20110421-1417-H167-GA (org.teiid.datatools.connectivity.feature.feature.jar 7.1.1.v20110421-1417-H167-GA)
Teiid DataTools Connectivity Feature 7.1.0.v20110215-1224-H420-GA (org.teiid.datatools.connectivity.feature.feature.jar 7.1.0.v20110215-1224-H420-GA)
Cannot satisfy dependency:
From: Teiid DataTools Connectivity Feature 7.1.0.v20110215-1224-H420-GA (org.teiid.datatools.connectivity.feature.feature.group 7.1.0.v20110215-1224-H420-GA)
To: org.teiid.datatools.connectivity.feature.feature.jar [7.1.0.v20110215-1224-H420-GA]
Cannot satisfy dependency:
From: Teiid DataTools Connectivity Feature 7.1.1.v20110421-1417-H167-GA (org.teiid.datatools.connectivity.feature.feature.group 7.1.1.v20110421-1417-H167-GA)
To: org.teiid.datatools.connectivity.feature.feature.jar [7.1.1.v20110421-1417-H167-GA]