$filter: The expression specified with $filter is evaluated for each resource in the collection, and only items where the expression evaluates to true are included in the response.

serviceRoot/People?$filter=FirstName eq 'Scott'

$orderby: The $orderby system query option allows clients to request resources in either ascending order using asc or descending order using desc.

serviceRoot/People('scottketchum')/Trips?$orderby=EndsAt desc

$count: The $count system query option allows clients to request a count of the matching resources included with the resources in the response.

serviceRoot/People/$count

$select: The $select system query option allows the clients to requests a limited set of properties for each entity

serviceRoot/Airports?$select=Name, IcaoCode

$top & $skip: The $top system query option requests the number of items in the queried collection to be included in the result. The $skip query option requests the number of items in the queried collection that are to be skipped and not included in the result.

serviceRoot/People?$top=2

$expand: The $expand system query option specifies the related resources to be included in line with retrieved resources.

serviceRoot/People('keithpinckney')?$expand=Friends

Supporting multiple filters:

Use the and/or operators to apply multiple filters.

References:

http://www.odata.org/getting-started/basic-tutorial