I have an interesting situation.  I got engaged recently and it seems the whole registering thing has already become an issue.   I live in a small apartment in Boston and will hopefully be buying something in the next two years time, so I am hesitant to register because of space constraints.   My mother has been waiting since the day I was born to go register with me.  She did not take the news well, so I thought we could register for some "upgrades" - new towels/sheets, things we could use no matter where we live.    
Now here's something to complicate things a bit more:  my FMIL isn't from America & she finds registries to be a huge no-no (her own words: "it's rude to tell people what you want as gifts")  I'm ok getting whatever gifts from her as this isn't anything new.  (she has bought be 3 sets of dishes since we started dating a few years ago!)
So, any suggestions on what serious basics we should register for besides towels and sheets?  I'm a huge baker, my FI is a great cook, so we really don't need any kitchenware. And how can we do this tactfully so that both our mothers are happy?