I copied your list and deleted the ones I haven't visited, made relevant notes in parentheses.
Many without notes mean that I was only there for a short time, or there as a child, or don't have anything interesting to offer as advice. East Africa (broadly defined as the TZ coast inland to Lake Albert and then northeast to the Horn of Africa) is my primary area where I could offer expertise to fellow Expo'ers. Also happy to discuss southern China. Have a fair amount of experience in the Caribbean, including being a citizen of a Caribbean country and having lived in that region, but it doesn't seem to be that relevant to this group. In East Africa, I haven't made notes next to various countries but feel free to ask questions in PM's if I can be of help - I have enough of an idea of many places in the region that I'm comfortable offering advice. And if I don't feel I know enough, or if I feel my knowledge of an area is "stale," I'll at least get back to you and tell you. Happy to help if I can.
ALGERIA DZ
ANTIGUA AND BARBUDA AG (Antigua only, and by sailboat, not driving)
ARGENTINA AR
AUSTRALIA AU (sadly have not done any substantial driving here, only have visited Sydney and Melbourne)
AUSTRIA AT
BAHRAIN BH
BANGLADESH BD (worked for a client headquartered here)
BELGIUM BE
BELIZE BZ
BOTSWANA BW
BRAZIL BR (have driven all around in the south)
BRUNEI DARUSSALAM BN
CAMEROON CM
CANADA CA
CAYMAN ISLANDS KY (many visits)
CENTRAL AFRICAN REPUBLIC CF (one visit)
CHILE CL
CHINA CN (primarily experience in the South, but have spent months at a time)
COLOMBIA CO (have driven the coast from Cartagena)
CONGO, THE DEMOCRATIC REPUBLIC OF THE CD (Albertine region only)
COSTA RICA CR
CÔTE D'IVOIRE CI
CUBA CU
CZECH REPUBLIC CZ
DOMINICA DM (many visits)
ECUADOR EC
EGYPT EG
ERITREA ER
ETHIOPIA ET (border regions & Addis)
FINLAND FI
FRANCE FR
GAMBIA GM
GERMANY DE
GHANA GH
GREECE GR
GUATEMALA GT
HAITI HT (pre-earthquake, have not been back)
HONG KONG HK (spent long periods there, but mostly as a child)
HUNGARY HU
INDIA IN
INDONESIA ID
IRAN, ISLAMIC REPUBLIC OF IR (Tehran only)
ITALY IT
JAPAN JP
JORDAN JO
KENYA KE
LEBANON LB (Beirut only)
LIBERIA LR (have driven from Buchanan to Freetown)
LIBYAN ARAB JAMAHIRIYA LY (pre-revolution only)
MACAO MO (a lot of experience, not that I think it's that relevant to overlanding)
MALAWI MW
MALAYSIA MY
MALI ML
MONACO MC
MONGOLIA MN
MOROCCO MA (several visits over the course of the last 10 years, including with vehicles)
MOZAMBIQUE MZ
NETHERLANDS NL
NETHERLANDS ANTILLES AN (lived on Curacao 2007-08)
NIGERIA NG (Lagos only)
NORWAY NO
OMAN OM (Muscat and coast)
PALESTINIAN TERRITORY, OCCUPIED PS
PANAMA PA
PORTUGAL PT
QATAR QA (Doha only)
RWANDA RW
SAINT BARTHÉLEMY BL (know it well)
SAINT KITTS AND NEVIS KN
SAUDI ARABIA SA
SENEGAL SN
SIERRA LEONE SL
SINGAPORE SG
SOMALIA SO
SOMALILAND (I added this, since it's not on your list)
SOUTH AFRICA ZA (more familiar with western ZA than eastern)
SPAIN ES
SUDAN SD (only familiar with area near Khartoum)
SOUTH SUDAN (I added this, since it wasn't on your list - multiple visits, can offer advice)
SWEDEN SE
SWITZERLAND CH
SYRIAN ARAB REPUBLIC SY
TANZANIA, UNITED REPUBLIC OF TZ (multiple visits for extended periods)
THAILAND TH (only briefly and too long ago to offer advice)
TRINIDAD AND TOBAGO TT (only Trinidad)
TUNISIA TN (pre- and post-revolution)
TURKEY TR
TURKS AND CAICOS ISLANDS TC
UGANDA UG (lived there for over a year)
UKRAINE UA
UNITED ARAB EMIRATES AE (many visits including remote areas)
UNITED KINGDOM GB (lived there for over two years)
UNITED STATES US (lived there for many years)
URUGUAY UY
VENEZUELA, BOLIVARIAN REPUBLIC OF VE
VIRGIN ISLANDS, BRITISH VG
WESTERN SAHARA EH (have overlanded into WS from north only)
ZIMBABWE ZW
