REFOLD: Refolding Protocols for Proteins
If you are struggling with refolding your protein then you may want to take a look at REFOLD. The Refold database currently contains 759 protein entries.
The help pages are really nice in that they explain how to use the database and contain background information. For example, here is a pdf of ‘A practical guide to protein expression and refolding from inclusion bodies.’ Based on the current entries the most common method of refolding is by dilution.
Here is a shot of a couple of search options (note: all the panels are not open)

Graphs are updated nightly to reflect the current contents of the database:

A neat feature of this database is that it allows users to create their own free account which will track their past searches.