Apart from my these observations about SharePoint 2010 REST API, today I found one more interesting thing that the field names used in queries are case sensitive as can be seen:
Searching by "Title" field gave proper result:
http://demo2010a:90/_vti_bin/ListData.svc/Company/?$filter=startswith(Title,'nad')
Searching by title showed no results:
http://demo2010a:90/_vti_bin/ListData.svc/Company/?$filter=startswith(title,'nad')
Searching by "Title" field gave proper result:
http://demo2010a:90/_vti_bin/ListData.svc/Company/?$filter=startswith(Title,'nad')
http://demo2010a:90/_vti_bin/ListData.svc/Company/?$filter=startswith(title,'nad')
Here are the rules for working with List fields and List names in REST.
1. Preserve casing, remove spaces and keep the first letter of each individual word as Capital. For example a field with display name "home aDdress" will be "HomeADdress".
2. If a special character like dot is in field name or List name it is to be treated like space i.e. if field name is "Add.ress" the REST equivalent will be "AddRess"