What is your favorite current newly learned/learning tune; you know, the one that makes you feel more alive than almost anything else? Mine is The Templehouse Jig (Michael Coleman). I discovered this by chance laying on my teachers music stand (the tune, not me) and can neither stop playing it nor hearing it in my head. I LOVE THIS TUNE.
Philo
I’ve recently rediscovered the Dublin Reel.
Reel by John Mccusker I found on The session website called For All the Cows. Reminds me of my childhood on a dairy farm. Wish I “played” the whistle at that age instead of trying to learn at 60. The cows were lucky I waited.
It’s not ITM, but lately “Men of Erin” by The Elders has been cycling through my head.
I’ve got a wonderful old jig stuck in my head these days, can’t seem to play enough of it: Munster Buttermilk. That’s my favorite right now on whistle, and I seem to prefer Gen or Oak or Feadog on this one over my smoother, more expensive whistles. It likes a bit of bite.
On the flute I’d say it’s probably Roarin’ Mary.
–James
The Street Player. Its composed by Ed Reavey and a great flute/whistle tune.
For me its The Irish Washer Woman
“Trim the Velvet”. (When I’m not playing my latest composition.)
FOr recently picked up tunes, I’m really enjoying Crooked Road to Dublin, which I picked up from a piano accordion version.
For “revisited” tunes, Gravel Walks appeals to me more and more and more. I also just figured out how to play “The High Reel” which has bugged the bejaysus out of me everytime I had heard it recently. Turns out I had learned it eons ago on a different instrument by a different name (“Sandy Duff”). So when I sat down to get the fingering for flute, it came in a matter of about five minutes 
Ah, Munster Buttermilk; that is competing for my limited head space as well…
Philo
Top of the Cork Road, a sweet little jig
I also just discovered Tripping Up the Stairs, which I really like.
Every slipjig I can find. I catch my family humming Butterfly, Foxhunters, Rocky Road, and a coupla others, simply because I play them too much.
Also, The Leaving of Liverpool (low whistle) and Spoot O’Skerry (Bb Flute).
The one I sing in the shower is the first reel from Flook’s Eb Reels (I don’t know which album). What is that tune?
Ahh, slip jigs. Boys of Ballysodare and the Snowy Path.
I finally got a handle on Tar Road to Sligo, which has a cool lilt to it.
And I like to play Jump at the Sun on C whistle, though I can’t get
anyone to join in on it. The accidentals in the A part are fun to
play around with. You can vary the first 2 measures as:
|DFA ^G2 A |^G2 A ^G2 A |
which really adds some tension (though you have to be careful you
don’t start sounding like a car alarm – try it, you’ll see what I mean).
Farrell O’Gara.
Top it Off and Promenade are two great slippies!
I play a reel called Boys of Ballysodare. Well, I play at it. I haven’t learned it yet.
Currently I’m unable to pick up my whistle without running through my list of Holiday tunes 
Love The Wassail Song–makes it socially acceptable (nay, fun) to be drunk in the street! 
Three parts, each played singly? Sounds kind of like the Flogging Reel? Usually followed by the Five Mile Chase? That’s a great reel.
i’ve been playing that a lot too. right now, though, it seems like i can’t stop playing “Maid Behind the Bar”.
both are on John Carty’s latest, which has been getting considerable playing time on my CD player, so that would probably explain it.