I first noticed this with the MongoDB plugin (v 1.1), but then realised that this occurs with all automatic tool installers that I can find.

When choosing an automatic tool installer of type "Extract *.zip/*.tar.gz", or "Run Command", the UI provides a "label" field, which can be used to configure which kinds of nodes use a specific installer. When I have slaves on many platforms, this allows me to install (for example) the mongodb-linux-x86_64 build on a linux slave, and a mongo osx build on an osx slave.

The "Install from mongodb.org" option doesn't include a label field, even though I can configure multiple installers for different platforms. The first installer is always used no matter what.

Update: while writing this bug report, I realised that this behaviour seems to be present for all "Install from XXXX" options, across many plugins.

This behaviour is fine for a platform independent tool like ant, but doesn't work well for native code (such as mongodb).

Workaround
Create "Extract *.zip/*.tar.gz" installers with appropriate labels and download locations such as "http://downloads.mongodb.org/linux/mongodb-linux-x86_64-2.0.3.tgz" to accomplish the same thing. Note that this won't work for more complicated automated tool installers like the one that installs java from java.sun.com.