nope, there isnt as far as I know.. and that is why I think the blogs aren't a great way to communicate with folks..
try the forums for that!!
the blogs here seem more like the mutterings we murmur at the kitchen table.. pretty private and only meant for close friends..
if you insist on keeping track on where you commented, try adding the blog author to your favorits,- or become a fan even!
and if all fails, use 'stickies' on your computer to note the blogs via copy/paste.
(do you get 'stickies' on PC's?)
P-S: dont count on me finding your reply here.. I may never find your blog again.. ever..