The manufacture (and sale) of .380 ACP pistols has been going up by leaps and bounds vis-a-vis the 9mm, which can be confirmed from the Bureau of ATF Statistics over the past few years.
For the year 2010, .380 ACP turns out to be the MOST POPULAR handgun calibre!
2008: .380 ACP - 278,945; 9mm - 421,746
2009: .380 ACP - 390,897; 9mm - 586,364
2010: .380 ACP - 665,510; 9mm - 629,995
Ref:
http://www.atf.gov/statistics/