Using the Explorer View, you can manually copy forms into the form library. SharePoint supports bulk upload as well and you can save from an Office client to the http site. You've probably discovered these options already.
SharePoint is a very simple way to get views and reporting on InfoPath data. The limitation is in the promotion - it's flat. That means you will never be able to do advanced queries. You'll be able to pivot on 1 or 2 columns - SharePoint supports Group By in the view settings. By default you can set the GroupBy to collapsed. In addition, you can implement filters to narrow the view down. I have used both techniques to create a manageable and discoverable view on a form library with many hundreds or even thousands of forms.
SharePoint views have some default features - like the [me] filter. It would be cool to hook this up but I haven't figured out how to promote the InfoPath properties in a format that will allow [me] to work on it. In addition, there is a calendar view and you can use date time promoted properties to set start time and end time.
You can use FrontPage to create views onto Access and SQL data. In addition, you can develop SharePoint webparts to query a database or a form library and display data in a richer way. Sounds like you want to use Access data to prepopulate forms. One way to do this is to export the data into an Excel spreadsheet that binds the data to a schema and saves it as xml files. Then, you'll have to upload the xml files to the form lib and relink them. Don't know if this will work and it may be problematic to map the Access data to a very hierarchical XML structure, but it's worth a shot. Otherwise, you could create some automation in your InfoPath form that automatically loaded the data from Access, saved it as a form and looped through the database doing this. The form would have to be full trust and it would be a one-time operation.
There is no realtionship between a SharePoint list and a form library, although you can use SharePoint list data connector in your form to prepopulate data. The Form Library is derived from a Document Library and is id 115. Best way to link is through the InfoPath form.
Patrick Halstead
Project Manager at Qdabra