If Irish music's your thing, then you could do worse than check out my website for a rake of original tunes in mando tab format. And volume one of my mandolin tunebook which has trad as well as original tunes in mando tab format. Go to Pay The Reckoning and follow the appropriate links.
On the other hand you could do as others have suggested and book yourself a table at the mandolin cafe ... I've contributed a quare hape o' mando tab to its archives! (And for those with an iron constitution, you can hear me play two tunes I wrote in memory of my da - "Gerry Crossey's Tune/Gerry Crossey's Hornpipe" - at The Mandolin Cafe MP3 Page.
G'luck wi' the mando.
Slán go foill.
Aidan Crossey (aka derrymacash ... aka Pay The Reckoning)