Currently, I am unaware of any member-level way that allows you to see accurately your post count and topic creation count. There are entries for that in the source for each page, but their accuracy (especially for accounts that pre-date the New Hotness) is questionable.
If the much anticipated "Search" function is impremented, perhaps it will allow searching based on B.net member-name. I could see some advantages and benefits to that. The search result screen could have a # of posts and # of topics summary. Plus, you could also take a look at the general overall pattern of how tht member posts and their "personality" if you will.
Wishful thinking aside, I am curious. Other than just wanting this info, do you have a particular reason that your post and topic count would be information that you want?