Web resources are extremely useful arent they!
CRM Parameter Filter - Invalid parameter''blah=1" error
However i came across a snag when i was unable to pass over certain parameters to them. A quick look at the SDK showed me that the webresources are only allowed to take a parameter named "data". typical example shown below.
http://CRM2010SERVER:5555/CRMORGANISATION/WebResources/MyWebResourceFile?data=1
It might be worth testing out the DisableParameterFilter registry entry that i blogged about back in 2009 will be a way to bypass this rule, but as of yet i havent needed to try it !