My idea is simple.
When someone clicks to give a kudos change the colour so that it is easier to remember where you have given kudos.
Reasons why this can be useful:
-Helpful to distingish between useful posts.
-Can act as a bookmark so that with one glance you know which articles you like on the blogs and news.
-In the approved helpers quiz, can be useful to remember which quizes you have taken.
Currently, when you kudos a post, the only thing it changes is by giving a new tick. I think its not as easy to see as if you have a colour change.
And in the blog section