Not to be too much of a tease, but looking ahead, VS2010 uses a new rehostable editor component, you can hear some about it here: Hanselminutes Podcast 147 - The new WPF-based Text Editor in Visual Studio 2010 - Interview with a Dev
Anyway, this means that the F# editing experience in VS can, in theory, be completely decoupled from VS and hosted in a lightweight editor. Which means it's possible F# could ship a sample or something that's 'the VS editing experience' (tooltips, squiggles, intellisense, ...) without VS.
To be clear, we on the F# team don't yet have any concrete plans to ship such a thing, but the new internal factoring of VS and the editor and MEF and whatnot should make this easy to do (we've prototyped it over a weekend, and it mostly works). So hopefully look forward to cool things in the future.