Count with max(date)

I have a historical data table where most of the data is captured once a month. The sites can change but most is the same.

I need to pull the count from only the most current month for a report and was using something basic:

Select count(site_id) as lastmonthcount
from sitehistory
where capture_date = '09/30/2012'

Now I need to make it so I don't have to maintain the report every month and the capture date can pull the most recent counts.

I have
Select count(site_id) as lastmonthcount, capture_date
from sitehistory
group by capture_date
having capture_date =max(capture_date)
order by capture_date desc

I get the following results
lastmonthcount capture_date
29918 09/30/2012
39048 08/31/2012
36768 07/31/2012
38689 06/30/2012

What I really want is just the top record.

Can someone help me? I know I am close just
missing something

Thanks
Karen

Try:

Select TOP 1 capture_date, count(site_id) as lastmonthcount ...