A very odd thing happens when you search for posts by a particular person within a date range. The first page is fine, but when browsing to the second page, all their posts are brought back!
For example, if you search for all posts for the month of November 2004 by "lausey", you get back 2 pages, the 1st page gets the latest posts as you expect. When you go to the second page, you suddenly see 10 pages listed. In my case it is fine because I have not that many posts, but when you search on someone who has a lot of posts, the 2nd page would bring back a date which is much older than you expect.
If this is not very clear, then let me know and I will try and find other examples for you to try out.