what dll's do i need to reference in my data access layer ?  there are a whole bunch in the runtimes\.net3.5 directory

some seem obvious but what about thing like entityspaces.web.dll  or entityspaces.web.design.dll ??

Im using sql server 2005 and am building a web application

1. EntitySpaces.Core.dll
2. EntitySpaces.Interfaces.dll
3. EntitySpaces.Loader.dll (or EntitySpaces.LoaderMT.dll)
4. And finally, whatever data providers you need, ie, EntitySpaces.SqlClientProvider.dll
   

If you are doing ASP.NET work and want to use our esDataSource control you would also use EntitySpaces.Web.dll and EntitySpaces.Web.Design.dll (this one is design time only, you don't have to ship it). Most of this is covered in the getting started PDF which is on your menu after installation.