In a blog post today, person-to-person lending pioneer Zopa announced several usability improvements in its upcoming release, a new My Zopa screen and Quick Lend area.

But what caught our eye was Zopa's upcoming option to guarantee the return of principal for its lenders. There's no free lunch, of course, so an insurance premium must be paid when lenders choose this option. Even though that will cause returns to fall to a more "normal" rate, it could be a psychological boost that brings in more funds. At minimum, it will generate press coverage.

The new guarantee is still awaiting U.K. regulatory approval. We'll look at it in more detail when it becomes available.