>New feature coming to NHibernate: http://ayende.com/Blog/archive/2010/01/27/nhibernate-new-feature-lazy-properties.aspx
>
>Does EF have this functionality available?

Looks like it's in EF in .NET 4 - but I haven't tried it

One thing I noticed in the link:

"What about multiple lazy properties? NHibernate support them, but you need to keep one thing in mind. NHibernate will load *all* the entity’s lazy properties, not just the one that was immediately accessed."

Not sure whether this is a good thing or a bad thing - bottom line is it will depend on the circumstances but there's nothing you can do about it. Also I've no idea whether EF will have the same behaviour.......