How to add metatags to a view? I need to add rel=canonical meta tags to some views. There are a couple of sandbox modules for the metatag module but I'm looking for a more simple solution.

Couldn't I just use views_php and drupal_add_html_head()?
Try the Context Metadata module. It can add metadata to node and non-node pages. The following metadata tags can be set according to a context: Title, Description, Keywords and Canonical URL.