Slipstreaming went almost fine, but there are some problems related to Internet Explorer 7. The browser works fine, but the "About" windows doesn't work and Internet Options in Control Panel are the old IE6 ones.
EDIT: Here's a screenshot (tested with VirtualBox 1.6.0):

I also noticed that Automatic Updates shows me KB898461 (package installer), shouldn't this be included in SP3?
Unfortunately, I don't have the log anymore, but I remember what I included.
Source is Windows XP Service Pack 3 (previously slipstreamed with "/integrate" command on a XP SP2 CD)
I used HFSLIP 1.7.6
Files in HF folder:
msxml4-KB941833-ita.exe
rootsupd.exe
Windows-KB890830-V1.41.exe
WindowsUpdateAgent30-x86.exe
WindowsXP-KB952287-x86-ITA.exe
directx_mar2008_redist.exe
Internet Explorer 7
IE7-WindowsXP-x86-ita.exe*
IE7-WindowsXP-KB938127-x86-ITA.exe
IE7-WindowsXP-KB947864-x86-ITA.exe*
* Refreshed file versions (re-downloaded after the date change)
Windows Media Player 11
wmp11-windowsxp-x86-it-it.exe
windowsmedia11-kb944110-x86-intl.exe
windowsmedia11-kb942264-x86-intl.exe
WindowsMedia11-KB939683-x86-ITA.exe
windowsmedia11-kb939209-x86-intl.exe
WindowsMedia11-KB936782-x86-ITA.exe
windowsmedia11-kb935552-x86-intl.exe
windowsmedia11-kb935551-x86-intl.exe
windowsmedia11-kb933547-x86-intl.exe
windowsmedia11-kb932390-x86-intl.exe
windowsmedia11-kb931756-x86-intl.exe
windowsmedia11-kb929773-x86-intl.exe
windowsmedia11-kb929399-v2-x86-intl.exe
windowsmedia11-kb928788-x86-intl.exe
WindowsXP-KB941569-x86-ITA.exe
Files in HFCABS folder:
MUAuth.cab
MuCatalogWebControl.cab
muweb_site.cab
SWFLASH.CAB
wbemoc.cab
Files in HFTOOLS:
HFANSWER.INI
Files in HFCLEANUP:
XPSP2.EXT
I used nLite only to make the ISO, I didn't remove nor tweaked anything.
Any idea of what it can be?
Thanks in advance