i just got my a1 last week and have been playing around with it to learn the functions but today noticed a blue squiggle on the right of the frame
i cleaned the lens but it still shows so i looked back and noticed it on the first bit of recording i did with the camera but very faint
i think the reason i hadnt noticed till now was that id only played around indoors
and today tried it outside and it was very prominent

http://i58.photobucket.com/albums/g277/kevsid/IMG_0102.jpg

Send to Canon Factory Service there in the UK, be sure to include a tape which shows the problem.