On Friday December 30th the FTSE 100 closed at 5619.
Personally, I am bullish, and think that a 10-15% rise is within reason, based on fundamentals. That would take the FTSE somewhere between 6181 - 6462.
5 year chart:

Articles:
http://uk.biz.yahoo.com/moneyweekly/stocksshares2006.html -
Excerpt:
"Stock markets around the world have enjoyed a pretty good run in 2005. In Britain , for example, the FTSE 100 index of the biggest companies is up more than 15%. “We began 2005 heavily overweight equities and have not been disappointed. Equities have risen sharply across all major markets,” said Paul Niven of F&C Asset Management, one of the biggest fund managers.
Shares have been bolstered by strong corporate earnings and resilient global growth. Equities also seem relatively cheap. Niven said: “Share prices have not kept pace with earnings growth, so although markets have ended the year higher – equity valuations have actually not become any dearer.” The big question is: will stocks and shares continue to do well in 2006? Or should we take our profits and run – or at least stuff the money in a savings account?
Stuart Fowler of AXA Investment Managers is keeping faith with UK equities. He said: “We expect another good year for the stock market in 2006. The market's valuation is OK, the international economic outlook is broadly supportive, and takeovers are likely to be a feature again - corporate activity always gets the market's juices flowing.” He even dares to hope that investors might get over their infatuation with property. “The stock market has been rising steadily since March 2003. Surely there must come a time when the love affair with buying houses wanes in favour of shares again.”
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I shall strive to update this thread periodically.