After reading Karthik’s comments, I decided to compile a short list of WordPress plugins that let you display your top posts’ links on your blog’s sidebar.
– Top Posts by Category Plugin – Actually lets you display non-categorised top posts as well.
– Daily Top 10 Posts – Daily and cumulative post stats.
Disclaimer: I haven’t contributed in any way to those plugins’ development, neither have I personally tested them. Therefore I take no responsibility over possible compatibility problems, lack of updates, bugs and the such.