Favourite places for cocktails?

So, I flippin' love cocktails. What are your recommendations for good places to go?

I recently discovered Slighhouse (used to be Bar Kohl, http://slighhouse.com/) and really loved their offerings - I like imaginative cocktail lists with a sense of humour and these all had fun wee extras like lollipops or postcards.

Panda & Sons is also a fave (http://pandaandsons.com/).

Where else can I please my tastebuds and punish my liver?

Edit: Thanks everyone for the suggestions. Some places I haven't heard of there that will be getting tried very soon!

Just thought I'd do a wee round up here of all the suggestions:

• Panda & Sons on Queen Street

• Bramble also on Queen Street

• The Last Word Saloon on St. Stephen Street

• Lebowski's on Morrison Street

• Tonic on North Castle Street

• Slighhouse on George IV Bridge

• The Blackbird on Leven Street

• The Voodoo Rooms on West Register Street

• Timberyard on Lady Lawson Street

• The Bon Vivant on Thistle Street and again on Dean Street

• Rick's on Frederick Street

• Heads and Tales on Rutland Square

• Lucky Liquor on Queen Street

Keep 'em coming :)