CUPS ships with good support for HP LaserJet-type printers. You can install the generic driver as follows:

root# 

lpadmin -p laserjet4plus -v parallel:/dev/lp0 -E -m laserjet.ppd

The -m switch will retrieve the laserjet.ppd from the standard repository for not-yet-installed PPDs, which CUPS typically stores in /usr/share/cups/model. Alternatively, you may use -P /path/to/your.ppd.

The generic laserjet.ppd, however, does not support every special option for every LaserJet-compatible model. It constitutes a sort of “least common denominator” of all the models. If for some reason you must pay for the commercially available ESP Print Pro drivers, your first move should be to consult the database on the Linuxprinting Web site. Linuxprinting.org has excellent recommendations about which driver is best used for each printer. Its database is kept current by the tireless work of Till Kamppeter from Mandrakesoft, who is also the principal author of the foomatic-rip utility.