About a year ago we are developed for internal use inprocess MOLAP engine that perform aggregation of a large amount of data.
We using it only as a part of our platform because we was sure that such a system without custom memory alocation, paging etc is not viable solution, but some time ago Microsoft published beta version of PowerPivot - tool that perform multidimensional analysis of flat object collections and visualization via Excel pivot tables\charts with the same 'issues' on x86 as our app.
And the question is
Should we ignore memory and simply deploy x64 version without any memory pain. and x86 versions with comments in user docs?