Hey, can anyone suggest some good acoustic bands/ artists.

All i know is Flight of The Conchords (which are amazing), but im looking for something more serious

Camilla Choads.
Eric Hutchinson, he's a god
Top 15:
Neutral Milk Hotel
Smashing Pumpkins
Elliott Smith
Devendra Banhart
Eve 6
The Clash
Imogen Heap
Ingrid Michaelson
Minus The Bear
The Replacements
Bright Eyes/Conor Oberst
Do you want like solo acoustic and vocals, band with an acoustic guitar, fingerstyle, or what?

Check out Jack Johnson, Jason Mraz, John Mayer, and Anthony Green(Singer of Circa Survive). There's TONS of acoustic artists, I'm surprised that Flight of the Conchords is all you know of.
Kotaro Oshio, Trace Bundy, Bandits of the Acoustic Revolution, Thomas Dybdahl, Ki:Theory, Neko Case, 16 Horsepower, Against Me!, Rusted Root, Nick Drake, Iron & Wine.

Have fun.
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thats like... a really broad range... how can you like dragonforce AND beethoven Dx
City and colour?

Nicholas Barron?

Bon Iver?
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lets see...

Iron and Wine

Brand New's acoustic stuff is excellent

City and Colour


Dashboard Confessional


Incubus do a lot of acoustic stuff

The Spill Canvas

Seether's One cold Night album

A lot of bands do acoustic versions of their songs

you could also check out the punk goes acoustic albums, they are pretty good.
But there's no sense crying over every mistake, you just keep on trying till you run out of cake.