yes. like [MENTION=10251]Red Herring[/MENTION] said, it's been generally accepted as fact by sociolinguists. i do experience this, especially in a mixed sex group. i very rarely take it as anything but an interesting study of human behavior and our culture, besides allowing myself to use this knowledge to squash out any feelings of inferiority or "i'm talking too much" that may threaten as a result of this pattern of communication.
basically what i mean is, i don't fault men for this. it's kind of encoded in them by the patterns they learn as very young boys acquiring language and social skills. and i believe that it's so unconscious that if a woman really were to assert herself, in most instances, the men would respect that and give her a voice (slight guilt might even result if the men realized the effort with which the woman had to get herself in there). the myth that women talk more has everything to do with their style of speech rather than the number of words they generate or the length of time they talk for. women take more frequent, quicker turns which might lead men (who are more prone to monologue-style speech) to perceive that a woman is talking a lot. also, women are more prone to spend words on emotional, kind of meta-conversational messages, like encouraging someone to come sit closer, or noticing a partner's reaction to something within the conversation.
this knowledge can help women to a) know that regardless of what they feel, try to look at the conversation objectively before you decide you're talking too much, and b) command the attention of men by speaking a little more in their style when needed. i have no intention of changing my conversational style to a male one, but much like code switching between dialects and different formalities, it can be a useful tool. and finally, since these are patterns taught and learned at a young age (and women/mothers are generally the primary force in a child's language development) we can teach our sons and daughters differently! like RH also said, it's not as much of an issue as it was 50, 100 years ago when culturally, women were explicitly subservient in many ways. since that dynamic is shifting on other fronts, it should be easier than ever to reshape those relics in our unspoken conversational rules that represent a time past.