For the romance readers on your Christmas list, I recommend the following titles:
Outlander by Diana Gabaldon. Quite simply one of my favorite books ever. Lush prose, wonderful historical detail, and likely the best loved romantic hero of all time. Ms. Gabaldon originally began writing this as a "practice novel." Made aware of this fact and overcome with artistic jealousy, a writer might hate her... except that she created such a heartbreakingly fantastic story. And so we love her.
Charming the Highlander by Janet Chapman. I enjoyed this story so much for its multi-layered emotional conflict and fun adventure and pacing. (I'm not sure why the beautiful uploaded cover is so small. Forgive me that I have not mastered blogger yet.) It's a contemporary novel set in Maine, where the author lives and has wonderful adventures of her own. Ms. Chapman is prolific and once introduced to her work, I'm sure you'll be delighted to find that there's plenty more to read.
The Protector by Madeline Hunter. Any author who can create an entertaining love story with The Black Death sweeping through Europe as the backdrop has a gift. I first read another terrific novel of Ms. Hunter's and enjoyed her pacing and intrigue. I went back to read all of her work and found she is consistently superb in her writing. She also always has terrific characters and is an automatic buy for me.