I'm sure this is connected to many of the same issues being discussed here (http://drupal.org/node/230103), but wanted to bring to your attention that CiviNode on a pre-existing Drupal 5.7 site causes a fatal error when attempting to upgrade from CiviCRM 1.9 to 2.x.

The error is as follows:

Fatal error: Call to undefined function crm_uf_get_match_id() in /htdocs/sites/all/modules/civinode/civinode_utils.inc on line 593

If I remove the CiviNode folder from my site/all/modules directory, the upgrade completes successfully.