I have posted about how to kill the word verification stuff on your blog here.
One thing that I have found helpful is to enlarge the image - the easy way to do this is just to hit Control +. You can do it a number of times and each time the page will zoom in until you can see it.
When you have finished you just hit Control - and it will zoom out again.
Another reader has also suggested that if the words are particularly difficult to read that rather than trying to enter them, just hit the little circular refresh button until an easier one pops up. I have found this to save quite a bit of time.
And don't bother doing capital letters etc because the captchas aren't case sensitive!
I do apologise for wittering on about word verification so much - but really! Having just commented on 60 blogs who linked up to Food on Friday, I am renewed in my campaign to try to eradicate it.