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Install packages:

poldek:/all-avail> install cups hplip

In case of problems run (as user being in 'lp' group) hplip testing utility:

hp-check

It will print url used in cups www interface.

--------------------------
| DISCOVERED USB DEVICES |
--------------------------
libusb couldn't open USB device /dev/bus/usb/001/001: Permission denied.
libusb requires write access to USB device nodes.
(...)
  Device URI                                       Model                                          
  -----------------------------------------------  
  hp:/usb/HP_LaserJet_3050?serial=00CNSK531742     HP LaserJet 3050 

It may also detect scanners:

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| SANE CONFIGURATION |
----------------------
'hpaio' in '/etc/sane.d/dll.conf'...
OK, found. SANE backend 'hpaio' is properly set up.
Checking output of 'scanimage -L'...
libusb couldn't open USB device /dev/bus/usb/001/001: Permission denied.
libusb requires write access to USB device nodes.
(...)
device `hpaio:/usb/HP_LaserJet_3050?serial=00CNSK531742' is a Hewlett-Packard HP_LaserJet_3050 all-in-one

Start cups daemon.

Configure CUPS via it's web interface by opening page (be sure not use any proxy otherwise you will get noauth error): http://localhost:631/ select tab “Administration” click “Add Printer”. Wait while select “Local Printers”/“HP Printer (HPLIP)” click “Continue”. Paste device URI as detected in hp-check (in my case it was “hp:/usb/Officejet_4300_series?serial=CN68MGJ23N04GR”) Add Printer selecting name without spaces and other special characters, select ppd file for your brand of printer.

In case of problems check http://wiki.archlinux.org/index.php/CUPS