The WCF Data Services Team released a client library to make it easier to interact with OData services from Windows Phone 7.
The major caveat (and bummer) with the library is that “LINQ support in the client library has been removed as the core support is not yet available on the phone platform.” I have a tip/trick for LINQ lovers like me that will allow you to still use LINQ query syntax to compose your query (kind/sorta). A tool I find useful to when writing OData queries on Windows Phone 7 is LINQPad. I use the tool to write LINQ queries against my data service, then get the url syntax query translated for me:
Once I get my LINQ query right, I just paste the http string into my app. I’m still surprised about how many people aren’t aware of LINQPad. You must check it out if you use LINQ in your day to day coding (which I am sure most of you do now). You can learn more about using LINQPad against OData services (amongst many other uses) from the product site:
Hope this helps save you some time!