Hi,
I've been in Ireland since last October last year, although i'm in Dublin.
The PPS numer (tax number) isn't too hard to get, all you'll need is proof of address. For this I used a letter from my employer basically just saying I was employeed and where I lived.. they accepted this no problem. They'll also say it'll take about 2 weeks for your number to come through, however mine only took about two days.
Bank account is a differant story though.. absolute pain to setup. To get an account setup you need two bills in your name proving your address.. which is quite hard if you've just arrived in the country. My advice is to get your PPS number first, then attempt to get a bank account setup as the letter you get with your PPS number is probably the best (and easiest) proof of address you can get. FYI - I'm with the Bank of Ireland, and once I did have all the proof I needed they were fairly decent, my account was setup the same day which was grand, although I did have issues getting my laser card (get one of these btw - they're basically an eftpos card and can save you from the loooong queues for the ATMs as you can just get 'cashback' when making a purchase!) but I think this was more time of year relatedd (was around xmas/new years time).
In regards to IT work in Galway.. All I know is that Hewlett Packard's European software devision are based there (I'm contracted to them, so I'm in Galway every so often). They seem to take on a lot of contract staff and seem to treat their employees fairly well, so that's one place I'd suggest you try.
In regards to websites.. www.monster.ie and www.jobs.ie are the two I used, used to get calls on a daily basis.
Oh, and you won't need to setup a company or anything unless you're contracting.. (which is quite likely if you're on a 1 year visa). I wouldn't worry about it, if you go through a recruitment agency they'll sort you out.
Ireland's great fun to live in, you'll enjoy it. Oh, and Galway is mainly a university town.. so expect lots (even in Irish terms) of drinking.
I think that's enough for now.. if you want to query anything just hit me up with a pm.