Hotplug detects it BUT there are still no /dev/dvb
Any ideas?

You have to create them manually or by the script included into the drivers sources. It is called MAKEDEV-DVB.sh.
For configurations using the old /dev system it has to be ran once. With udev you have to run the script at boot including (copying) the script in /etc/rc.d/rc.local.
May be I'm wrong, but I suspect Skystar1 is not supported by the recent drivers from linuxtv.
I would check Linuxtv web site if their driver is suited for Sktstar1.
Hope this helps
Ciao

Thanks for the answer, but anyways...
I can't launch any tv-related program! For example, xawtv prints THIS:

can't open /dev/dvb/adapter0/video0: No such device

And that happens with anyy other program

I have runned MAKEDEV-DVB.sh and /dev/dvb appeared, but anyway nothing works.
The drivers for it are also loaded, so i don't see anything that can cause such error.

Output of lsmod | grep dvb:

dvb_ttpci 70156 0
dvb_core 74664 1 dvb_ttpci
saa7146_vv 43392 1 dvb_ttpci
saa7146 15140 2 dvb_ttpci,saa7146_vv
firmware_class 7296 1 dvb_ttpci
crc32 4096 3 stir4200,dvb_ttpci,dvb_core
ttpci_eeprom 2432 1 dvb_ttpci

Output of lspci:

00:00.0 Host bridge: Intel Corp. 82875P Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corp. 82875P Processor to AGP Controller (rev 02)
00:1d.0 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #1 (rev 02)00:1d.1 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #2 (rev 02)00:1d.2 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #3 (rev 02)00:1d.3 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #4 (rev 02)00:1d.7 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB/ER Hub interface to PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corp. 82801EB/ER (ICH5/ICH5R) LPC Bridge (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) Ultra ATA 100 Storage Controller (rev 02)
00:1f.3 SMBus: Intel Corp. 82801EB/ER (ICH5/ICH5R) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV35 [GeForce FX 5900] (rev a1)
02:05.0 Ethernet controller: 3Com Corporation 3c940 1000Base? (rev 12)
02:0a.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
02:0c.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 07)
02:0c.1 Input device controller: Creative Labs SB Live! MIDI/Game Port (rev 07)
02:0d.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
02:0d.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)