I recently installed OpenSolaris (the first attempts were using the current release, which was quite buggy, I managed with OpenSolaris 2009.06 snv_111 X86) on my HP dv 7-1245ca.

A few notes are:

• the livecd as well as the hard drive install booted with a squelching white noise, I appended "-B disable-audiohd=true" to the grub boot line.
• This laptop has an ATI 3200 HD video card, which works with the radeonhd driver 1.2.4. To enable I shutdown GDM and ran Xorg -configure then restarted X/GDM.
• Both the wired and wifi network interfaces work well.