You can pick up BurnStats for 79p at the Windows Marketplace or via the AAWP App Directory.
Keep an eye on your RSS numbers with BurnStats
Published by Ewan Spence at
Alongside his Google Analytics app, In the Know, Doug Rathbone has a second application for monitoring your web statistics, specifically for those of you using Feedburner to manage your website's RSS feed. BurnStats will let you see the stats for your RSS feed over the last 30 or 60 days.
Source / Credit: AAWP App Directory