Aren't they fun. If you want something slightly more earthy but in similar vein, look for Katie McAllister's regency romps or her contemporary novels (The Corset Diaries is a good place to start) - really really fun.
I adored the early Amelias. They were fun and frothy and good mysteries but some time around when kids become adults, well, they lose their charm for me.
If you want more Elizabeth Peters and IF you can find them read "The Camelot Caper", and then all the Vicki Bliss books - in order. Talk about fun. And I love most of her early stand alone books and the librarian series is good too. My personal favorite is the "Summer of the Dragon Bones". You can tell some one with archeological knowledge and who knows the Southwestern US wrote it. (this gives a good reason to pour through books at thrift shops and such and gives you an excuse to see what is in the craft sections.)
Cheryl