My site has approx 30,000 pages and I get between 4,000 and 10,000 pages crawled a day by googlebot. (Peaked at 12,000 in May).
Last few weeks have been at the low end (around 4,000 pages) but 28/3 was 6,260 pages.
I am getting about 2000 to 4000 crawled on my main site, which has around 3800 pages, and between 150 to 500 on the new site which is under 3 months old but has around 300 pages, it looks normal to me so far.. its when i see a huge spike i worry...