I took the exam 484 on friday 24/6 and the 486 exam on monday 27/6 and got 77% and 95% respectively. Also took the 141 (XML) test 3 days later but that result I'll post in the appropriate forum. Below I share my experience: Enterprise Connectivity - Exam 484
Overall it is not a hard exam, but you can expect some hard questions. I read both HF-EJB and HF Servlets and they cover the majority of the test. For the connectivity services I used the tutorials posted in this thread
Time should not be a problem. I had about 35 minutes left to revise the questions. OOAD with UML - Exam 486
I read both Larman's and Fowler's books thoroughly. It is important that you know the UML constructs and when to aply them, and UML Distilled is very good at it. But for this test it is more important that you know the iterative process and how to derive artifacts from the requirements and another artifacts, so Larman's book is the ultimate resource for this exam. For revision, you can use the notes from Ezequiel Cuellar available here
Personaly, I didnt use his notes because sometimes you need to remember the context in which the concepts were introduced and you can't get that from revision notes, so there is nothing like re-reading the concept from the book itself. As Larman's book is large, and most people (like me) won't read it twice thoroughly, I adopted a different strategy: I revised his book just by re-reading the boxes that contain all the important concepts. All chapters have one or more of these boxes, and you can rapidly remember the context surrounding the concepts as you read them.
Anyway, I included Ezequiel's notes here because some people may feel confortable using them as a revision resource. I just didn't work for me, but may work for you.
Finally, I recommend Mikalai Zaikin's Magnet Mocker engine. Now it has 3 quizes besides the ICE exam and they are very useful to test your skills. I would like to thank MZ for the time and effort he put on this.