Recently i have been back working on ear training with software such as GNU Solfege, in particular memorising and recognising rhythmic patterns. Looking on the web for more things to work on, i found this great site called worldjazz.ce that has pages of rhythm training exercises with mp3 files attached. Just click on the exercise you want to work on and play along till you feel comfortable. Great stuff!
If you havn't already got it do download GNU solfege too. Its a wonderful tool for improving your ear.