A few days ago Siemens PLM introduced a student edition of Solid Edge ST4 for free (http://www.plm.automation.siemens.com/en_us/products/velocity/forms/solid-edge-student.cfm).
The student edition is the full commercial version with only 2 restrictions:
- Any file saved in the student edition cannot be opened in the commercial editions.
- All drawings will have a printing watermark across them stating that it is in a student edition.
After you install it, there are quite a few learning aides that can be found under the Help menu and there is also a student forum available as well (instructions when you sign up for a copy).