Australia joined in last year, as part of the 60th Anniversary thing, and I guess it went down so well, that they've continued with it. The Australian SBS is a longtime broadcaster of the contest, even though it must be the early hours of the morning for them, if they watch it live !
The Australian ditty was my favourite song, so far.
Nothing too exceptionally strange, yet. Only one weird hairdo (Israel), and a couple of strange costumes (Bulgaria and Germany).