Great timing on this post. I tried glycerin for the first time today with Tabac shaving cream. I just put a squirt in with a peanut sized drop of cream. IMHO I got a better shave. The lather seemed more substantial too.
Tabac so far is my favorite cream. Seems not to dry out as fast and is slicker than others I have tried. I'm going to try glycerin over the next few days with Taylo'rs and Vintage Blade's creams and see if makes a diference for me.
I also tried Nivia Balm. Gave it about 15 minutes to soak in while I cleaned up my gear and did a post shave strop. Then spashed on Taylor's Bayrum. NICE! It was a fitting end to an enjoyable shave.