Extending SubSonic Generator

If you want to use subsonic v3 you can look at this issue that talks about IUpdatable: http://code.google.com/p/subsonicthree/issues/detail?id=30

This will let you use ado data services somewhat painlessly. You use a DB constructor that take a URI argument. This probably won't be a part of v3 but you could make changes like this yourself.

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using WcfClientTest.NorthwindService;

namespace WcfClientTest
{
    /// <summary>
    /// Summary description for WcfTest
    /// To run these tests, load this project, and somehow get a server running at the URI. 
    /// This can be done by updating the service reference to start the development server.
    /// </summary>
    [TestClass]
    public class WcfTest
    {
        private string baseURI = "http://127.0.0.1:49649/Northwind.svc";
        private DB ctx;

        /// <summary>
        /// Sets up test.
        /// </summary>
        [TestInitialize]
        public void SetUp()
        {
            ctx = new DB(new Uri(baseURI));
        }

        [TestCleanup]
        public void Cleanup()
        {
        }

        [TestMethod]
        public void Select_Simple_With_Variable()
        {
            int categoryID = 5;
            IQueryable<Product> result = from p in ctx.Products
                                         where p.CategoryID == categoryID
                                         select p;

            List<Product> products = result.ToList();
            Assert.AreEqual(7, products.Count());
        }

        [TestMethod]
        public void TestAddNew()
        {
            // add customer
            var c = new Customer
                        {
                            CustomerID = "XXXXX",
                            ContactTitle = "Prez",
                            Country = "USA",
                            ContactName = "Big Guy",
                            CompanyName = "Big Guy Company"
                        };
            ctx.AddToCustomers(c);
            ctx.SaveChanges();

            IQueryable<Customer> qCustomer = from cust in ctx.Customers
                                             where cust.CustomerID == "XXXXX"
                                             select cust;

            Customer c2 = qCustomer.FirstOrDefault();

            Assert.AreEqual("XXXXX", c2.CustomerID);

            if (c2 != null)
            {
                ctx.DeleteObject(c2);
            }
            ctx.SaveChanges();

            IQueryable<Customer> qCustomer2 = from cust in ctx.Customers
                                              where cust.ContactName == "Big Guy"
                                              select cust;
            // Returns null if the row isn't found.
            Customer c3 = qCustomer2.SingleOrDefault();
            Assert.AreEqual(null, c3);
        }
    }
}

And this is all there is to the service:

using System.Data.Services;
using Northwind;

namespace NorthwindService
{
    [System.ServiceModel.ServiceBehavior(IncludeExceptionDetailInFaults=false)]
    public class Northwind: DataService<DB>
    {
        // This method is called only once to initialize service-wide policies.
        public static void InitializeService(IDataServiceConfiguration config)
        {
            config.SetEntitySetAccessRule("*", EntitySetRights.All);
            config.UseVerboseErrors = true;
        }
    }
}

And for web.config:

  <system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
  </system.serviceModel>

This is more of a Subsonic 3 solution, but have you seen Rob's screencast using Subsonic3,T4, and the jquery grid to do pretty much most of what you are asking above (paging,sorting,filtering)

http://blog.wekeroad.com/subsonic/putting-the-ldquo-m-rdquo-back-in-mvc/